Category: shrubs in desert gardens

Best native shrubs for relentless desert heat

Here we are in September with weather that used to belong to July. With weather this hot it is too early to plant shrubs and trees in your garden. Wait until the daytime high air temperature is 90 degrees Fahrenheit or less. That 90F temperature is a useful indicator that the soil has cooled off enough. Hot soil can kill a newly installed plant within days.

Now, however, is not too early to plan adding tough native shrubs to help minimize the effects of the blistering heat next year.  (And it will be blistering hot next year. You can count on it, as the climate changes.)

While you may think “I need to plant big trees to cool my garden”, in fact, shrubs can definitely help by shading smaller areas and the lower sides of your home. Shrubs also keep the ground beneath them cooler and your overall garden at a lower temperature. The shade shrubs cast can create a haven for small wildlife like birds, lizards, bees and other insects.

So here are a few favorites, most are evergreen and all, but two, are native to the U.S. Southwest. (And those two are tough Aussies!)

1. Texas Ranger (Leucophyllum frutescens)

Also known Texas Sage, is a staple in desert landscaping due to its low water needs and striking silvery foliage. Imagine how glorious a hedge of these will look as this hardy shrub bursts into a display of purple blooms when the summer humidity gets high. It thrives in full sun and poor but well-drained soils, making it an ideal choice for low-maintenance gardens. Whatever you do, do not trim your Texas Ranger into a lollypop shape. It is naturally a loose, open, and graceful shrub that reaches up to 6 feet in height and will live for as long as 30 years. ProTip: trying to bring on blooms by watering the plant, won’t work.  It takes the increased humidity of the monsoon for the Texas Ranger to flower.

Desert Willow Chilopsis linearis

2. Desert Willow (Chilopsis linearis)

Desert Willow (Chilopsis linearis) can be grown as a small, messy tree or multi-trunk shrub. But messy as it is, the Desert Willow is popular because it will survive on its own with no extra water or fertilizer required.  Grows two to three feet a year and reaches a height of 15 to 20 feet and will live for over 40 years, if planted no higher than an elevation of 5,000 feet. It can be found in the wild in all the major Southwestern deserts from Chihuahuan to the Mojave to the Sonoran and the Colorado desert. As a desert native it needs little care and will produce red, pink, white, and purple flowers for months on end, but, I repeat, it is a messy tree dropping those long, brown seed pods for you to clean up. Now read about the next tree, a tidier hybrid of the Desert Willow.

3. Chitalpa trees (Chitalpa tashkentensis)

Chitalpa trees can grow as large, multi-stemmed shrub or a single-trunk tree. Unlike its cousin the Desert Willow, Chitalpa trees were created by scientists to be sterile and do not have those long, pointy seed pods. Their leaves are wider and create more shade. For that reason, the Chitalpa, like its cousin, is often planted as a street tree that blooms for months on end without supplemental watering. This hybrid thrives in endless sunshine and grows very fast to 30 feet tall. It’s said to live up to 150 years which seems a bit unlikely to me, but it you can be sure it will be growing where you plant it even after you are no longer gardening. Hummingbirds and bees love its pink or white orchid shaped flowers.

4. Jojoba (Simmondsia chinensis)

Jojoba (Simmondsia chinensis) has been an ignored shrub of the Sonoran Desert and Baja. The oil from the seeds was used for centuries by native Americans to treat skin conditions such as psoriasis and eczema.  A few decades ago, young women who were advocates of natural skin care “discovered” it and the oil was added to many skin and hair care products as a hydrating agent as well as having skin health benefits. But, skin care aside, it is simply a nicely shaped, round shrub that grows to a height of three to six feet with gray-green leaves year ‘round with seeds that go from green to dark brown. Oil is relatively easy to express from the seeds. It is highly drought-tolerant and reputed to live for decades.

5. Littleleaf Cordia (Cordia parvifolia)

Cordia parvifolia is a low maintenance plant which is not common in hot, dry gardens – but it should be. It is very drought tolerant once established. Ideally, it should be planted in locations with full sun and will produce large white flowers for months on end from early spring to fall with supplemental irrigation. This native of the Sonoran and Chihuahuan deserts is a dense shrub with arching branches that grow up to 6 feet tall and wide, making it suitable for hedges or as a standalone plant. You may have to call around to garden shops or plant nurseries to find it and you may end up finding it at a native plant nursery. In a pot it is disappointing, but plant it in the ground and this shrub with its white flowers becomes a beauty.

6. Feathery Cassia (Senna artemisioides)

Feathery Cassia, a native of Australia, is smaller shrub with feathery leaves that can tolerate very high temperatures. Known for its wispy, gray-green foliage and bright yellow flowers, which bloom in late winter and early spring, this plant provides seasonal color while maintaining year-round interest. Its flowers are also very fragrant attracting bees and other insects. Feathery Cassia grows up to three to four feet tall and wide, making it suitable for smaller spaces or as a border plant. It thrives in full sun and well-drained soils, needing little water beyond what falls from the sky once it is established.

7. Lantana (Lantana camara)

This native of the African tropics and popular in Australia, has spread around the world because it thrives in hot climates and blooms with colorful flowers for months on end. In the U.S. Southwest the Lantana camara, the upright version of this shrub, can become an attractive hedge. (In places like the damp U.S. SouthEAST it has become an invasive plant to be eradicated if possible.) Please note that for a hedge or a taller shrub you want to get the Lantana camara, not the low-growing, mounding Lantana montevidensis, also called trailing Lantana. Planted densely, as shown in the photo, the upright version will grow to 6 feet tall and as wide as 5 feet and can be trimmed into a tidy hedge. And as for flower colors — they seem to be endless! Mix them up.

8. Creosote (Larrea tridentata)

Why no photo for creosote? When doing research for this post, I asked the artificial intelligence ChatGPT for a list of native desert shrubs suitable for residential gardens to see how its list compared to mine. The first on its list was creosote. What?? Creosote is basically a weed in most Southwestern deserts. In Tucson there are actually neighborhoods with acres and acres of creosote “forests” dense with volunteer plants that are about 5 feet tall. They provide privacy to homes built in the back of the property decades ago, but no one planted the creosote bushes; they just grew. Creosote’s one claim to fame is that it/they can live for centuries. It’s true. New plants spring up from the roots of the older ones forming an ever-widening circle of creosote. One creosote circle in the Mojave was dated to 10,000 years old! Maybe one day ChatGPT will “read” this and realize that it gave bad advice. Don’t plant creosote.

Fixing that neglected side yard

It’s long. It’s narrow. And a home’s side yard is usually given little attention. Perhaps the original builder or an earlier owner spread a layer of rocky mulch on the soil and added a few stepping stones along the unused passageway from the front to the back of your home. But often it is not even considered part of the garden.

I have to confess that I ignored my current home’s side yard. A previous resident had, in fact, covered the 10 foot wide strip with reddish brown rock mulch. No stepping stones, however. There are pockets of grass where baby Mourning Doves huddle together and, in another corner, one rugged, volunteer Lantana plant survives. On one side of this passageway is a 6 ft. tall wood fence and on the other, the pale, sand-colored stucco wall for my living room. No windows — thank goodness.

Then, one day this last summer when it was once again 110 degrees fahrenheit outside here in Arizona I realized how much cooler that side of my home–the south side–would be if I planted something tall and shady there–a tree that was very drought resistant and wouldn’t die in relentless 100F+ heat.

Two drought tolerant trees for shade

My first thought was to install a Palo Verde tree in late October or November, when Fall planting season starts. I love this Arizona native’s brilliant yellow blossoms in April but once the flowers are gone, it would only provide a light screen effect with its leafless branches. Not much help countering the blasting sunlight in summer.

Then, I thought, what about another favorite of mine, the long-blooming Chitalpa (Chitalpa x tashkentsis)? Its branches would be ladened with pink flowers for months on end. And Chitalpa trees have leaves to cast more shade than the Palo Verde. Better yet, they grow fast and are so tough that in Las Vegas and Tucson they’re planted as street trees.

But I had to face reality: the passageway is only 10 feet wide and both the Palo Verde and the Chitalpa should be planted a minimum of 15 feet away from the side of a house.

So, a tall, skinny tree was called for–like an Italian Cypress (Cupressus sempervirens) which I know grows in Los Angeles and the Mojave desert. I haven’t seen many of them here in Sonoran desert gardens. A friend in Vegas planted a wall of them but looking at her garden now, maybe that is not the solution–especially when I check the price for 5 or 6 trees. I’ve been told that they suffer from red mites and if not watered deeply they will die.

Thanksgiving and cooler weather arrived and I stopped thinking about shady trees for my side yard. But in that doldrum week between Christmas and New Year, I began to consider it again.

Tough shrubs are a shady solution

Shrubs, I decided. Big, leafy, drought tolerant shrubs–maybe 5,6 or 7 feet tall–planted like a wall of shade next to the house. They will never grow tall enough to shade and cool the roof, but drought tolerant shrubs could block some of the blasting sunlight heating up the stucco. (Yes, Yes, I know I wrote about shrubs to cool concrete block walls last January. I’m now following my own advice.)

lantana hedge in Pasadena

Texas rangers (Leucophyllum frutescens) and upright Lantanas (Lantana camara) immediately came to mind. Both bloom often throughout the year, usually after some rain falls.

With some strategic trimming colorful Lantanas, like the ones in a hedge in Pasadena, can be encouraged to grow to 5 feet high. The Texas Rangers, however, I plan to leave untrimmed. I hate what commercial “gardeners” do to these beautiful, loose shrubs: whacking them into a lollipop shape with most of the lovely purple flowers cut off.

I’ll plant in February when we have had more rain and the soil is beginning to warm up. Now to figure out what to do to my back yard where a neighbor’s small tree died last year. It shaded both our yards and cut off the view from two homes behind us. Maybe that’s the right place for a Palo Verde or Chitalpa. I’ll let you know.

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  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

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How to make wildlife happy in your garden

You’re probably happy with your gardening efforts — with good reason. After all, you…
– planted a tree on the south or west side of your home to cool it
– removed your front lawn…and perhaps kept some grass in the backyard for a children’s play area
– even added one (or more) shrubs along that concrete block wall to minimize the heat.

So congratulations!

But this post is about why you should take a second look and see your garden through the eyes of a hummingbird, lizard, butterfly, quail, ground squirrel, or other wild creature that may live in your area. (But not javelinas or bears. They are clearly not animals you want to encourage.)

You may even want to re-think your garden as a haven–a kind of “happy place”–for wild creatures in your neighborhood and, thus, deserving of being a Certified Wildlife Habitat. Complete with an official metal plaque you can order and post in your front yard.

The National Wildlife Federation (NWF) and the Arizona Wildlife Federation set standards for having a Certified Wildlife Habitat and the official plaques come from them. They state that in order to be Certified a garden should provide wildlife with food, water, cover from predators, shelter for raising the young, PLUS do all this sustainably.

Start with food for wild creatures

For wildlife food the NWF suggests that you plant natives with colorful flowers and lots of seeds. It’s not necessary, however, to install only native plants because natives often bloom all at once. Other drought-tolerant plants that bloom and produce nectar or seeds at different months during the year can be suitable additions to your wildlife-friendly habitat. For example, you could plant South African natives Pink Trumpet Vine (Podranea ricasoliana) or Cape Honeysuckle (Tecoma capensis) for summer nectar for bees and birds. Humingbird and birdseed feeders can also be good additions to your backyard.

Then next to those vines, for example, plant a desert native Brittlebush (Encelia farinosa) and Mexican Gold Poppies (Escholtzia mexicana) to produce seeds. (Click below to see images of each.)

  • Pink Trumpet Vine Podranea ricasoliana
  • Capoe Honeysuckele
  • Mexican poppies in Tucson

Daily water is a must-have

To provide water, small shallow plant saucers or bowls are your best bet. Backyard fountains look glorious, but given the water problems–and potential water rationing–in the American Southwest, fountains should be disconnected and turned into planters.

Add a few small stones to the plant saucer to help smaller creatures, such as little lizards or little birds, drink comfortably from this water source.

Hidden from danger

Like humans, wildlife wants shelter from predators and shelter to raise young. These can be identical. Trees and shrubs–from short to tall–are excellent hiding places and nesting sites for birds, as well as havens for insects and lizards. These two photos, taken at the Tucson Botanical Garden, demonstrate wildlife-friendly gardening with shrubs at various heights combined with tall trees. There are also hiding places between the pots shown in the second photo.

What you don’t see in these photos are wide stretches of rock mulch with one or two plants. In a good wildlife garden at ground level, attractive ground covers, like cacti and succulents as well as Lantana montvidensis, hide small creatures from predators. Lantana is also a good food source for bees. (In the first photo a fountain appears in the back right side, but we do not recommend adding fountains these days!)

  • lantana montevidensis yellow blooms

Now, the last requirement for Certification as a Wildlife Habitat is that the garden is sustainable. You probably already do much of this: minimize or eliminate lawns, harvest water, avoid pesticides, use natural mulch, and use only drip irrigation.

Do all this and you, too, can have a Certified Wildlife Habitat. You can take the first step here.

While this post is primarily written for gardeners in the arid U.S. Southwest, these standards for a wildlife-friendly garden apply worldwide including Australia, the U.K., Cyprus, and Middle East where many Hot Gardens subscribers live. And where many native creatures are now struggling to survive due to climate change.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Should you get gardening advice from an A.I.?

You’ve probably already heard about ChatGPT, the new artificial intelligence program by OpenAI that is being called “scarily good.” Well, okay, I thought, maybe it is scarily good about techy stuff but how good is it with gardening advice? So I asked it this fairly basic question.

chlorosis shrub leaves

What causes plant leaves to turn yellow with green veins?

Here is what ChatGPT answered:

“Leaves on plants that turn yellow with green veins is a condition known as chlorosis. Chlorosis is caused by a lack of chlorophyll, which is the pigment that gives leaves their green color. The green veins on the leaves indicate that the plant is still producing some chlorophyll, but not enough to fully color the leaves.”

Okay — so far so good, I thought. And it continued…

“There are several causes of chlorosis, including:

  1. Nutrient deficiencies: A lack of iron, manganese, zinc, or other essential nutrients can cause chlorosis. This is often due to a lack of these nutrients in the soil, or a pH imbalance that makes it difficult for the plant to absorb them.
  2. Disease: Some plant diseases can cause chlorosis, such as leaf spot or rust.
  3. Pest infestations: Pests such as spider mites or aphids can suck the sap from the leaves, causing them to turn yellow.
  4. Environmental factors: Extreme heat, cold, or drought can stress plants and cause chlorosis.”

Item 2 is where ChatGPT begins to slip off the track. Leaf spot or rust do not look remotely like chlorosis; they are orangy yellow round spots on leaves not yellow leaves with green veins. Spider mites and aphids can damage plants but the effect is also spotty leaves–smaller spots–not leaves yellowing.

Then Chat GPT goes for the solution:

“To fix this issue, you need to find the root cause of the problem and take appropriate action. A soil test can help you determine the pH and nutrient levels in your soil and make recommendations for correcting any imbalances. You can also consult with a local nursery or botanical garden for help identifying and treating any diseases or pests that may be affecting your plants.”

That’s where ChatGPT ends.

My conclusion is that it offers basically good advice–as I did in an earlier post about yellowing leaves. But it falls short of the detailed information I wrote about, including short term, fast fixes to out-of-season yellowing leaves. ChatGPT clearly hedges its bet by suggesting that one should consult with a real local human being. (Or maybe a Master Gardener!)

Is ChatGPT trustworthy?

OpenAI, the company that developed this A.I. warns not to trust what ChatGPT says completely — that it sometimes just makes things up. This is a failing of other artificial intelligence programs, too. My guess is that it doesn’t want to appear ignorant — which, of course, opens the question about whether an artificial intelligence computer program can behave as if it is embarrassed by a lack of knowledge — but that is for another blog. Not this one.

I have another gardening question for ChatGPT — one that should be more challenging, but, unfortunately, the Open AI website is so busy that I haven’t been able to get on it again. I’ll report about it, if I can talk with it again.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

For goodness sakes, cover up that naked wall

Okay, you removed that thirsty grass in your front yard. You’ve also planted a tree or two or three around your home, shading at least part of your yard and the house, reducing the temperature. But off to the edge of your property–if your home is like most in the U.S. Southwest–is a dreaded gray concrete block wall.

That wall, if left bare, is a heat magnet. Nakedly exposed to direct sunlight the concrete absorbs heat during the day, even on cool days. Then after sundown, the wall releases the heat into the air creating a pool of warmth surrounding your home — just when you’re trying to cool things off at days end. And as the climate changes the wall-heater effect will only grow more intense. So what’s a smart gardener to do?

4 ways to help walls keep their cool
pomegranate fruit on bush

Plant shrubs in front of the wall. In one of my gardens I planted a row of the “Wonderful” variety of pomegranates (Punica granatum). These fast growers will reach a height of 6 to 10 feet. You may want to keep them trimmed to match the wall height because they can reach twice that height. Pomegranates need very little water. A special bonus with pomegranates is, of course, the fruit you can harvest in the late summer. In Fall the leaves turn a lovely shade of yellow before they drop. If you do not harvest the fruit you will have shrubs with bright red “ornaments” on them during the holidays. To see other shrubs for hot dry gardens, go here.

pampas grass hiding a wall

Plant tall grasses in front of the wall

On another wall in the same garden, a previous owner had planted Pampas grass (Cortaderia selloana). After a summer’s growth Pampas grass will be 8-10 feet high plus another 5-6 feet of seed plumes. And it does all this with little need for irrigation or fertilizer. By mid-winter, this perennial should be cut back to 18 inches tall. Be sure to wear gloves and a long sleeve shirt when you cut it back because the leaf edges are rough and serrated. It will re-grow to the same height in the following summer. 

Avoid planting the variety of Pampas Grass called Cortaderia jubata which is a highly invasive weed. Given the right conditions — usually by a stream — it will self-seed and spread wildly forcing out native plants.

privet hedge deergrass skirt

If you want to avoid Pampas grass — and many people do–another choice would be Deer grass (Muhlenbergia rigens) which grows to about 2 feet tall during the summer. It too grows seed plumes in Fall, but they are more modest in size than the ones of Pampas grass. While Deer grass will not cover up the entire height of your wall, it can be a base plant used with other shrubs. Unlike Pampas Grass it does not need to be trimmed back in winter. Needs very little water. To see other ornamental grasses for hot dry gardens, go here.

Install trellises along the wall

Trumpet creeper campsis radicans

Plant climbers on the trellises–like a Trumpet Creeper (Campsis radicans) from the eastern U.S. It is a self-attaching vine with bright yellow and orange blossoms.

This vine can grow as much 40 feet in one year! Because it is such a vigorous grower and can become invasive, it is best planted in a large container beside the trellis or arbor. It is tolerant of a variety of soil conditions and of heat and cold. Needs moderate water in summer.

To see other fast-growing climbers and vines for hot dry gardens, go here.

memoir writing guide ebook paperback

For the unexpected — Kool Deck your wall

Paint your concrete block wall with “Kool Deck” or another heat-reducing finish normally used on pool decks. These finishes come in a variety of colors so you can give your garden walls a custom look.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Birds and cactus on the move

On Christmas Day the Audubon Society turned out thousands of its members for the 122nd annual bird count.

The goal of the bird count is not only to calculate how many of which birds are where, but if there are any changes. Changes like non-appearance of certain birds which could mean that a bird species has moved to a new area or, in the worst case, become extinct.

While the results and post-count analyses of the 2021 Christmas Bird Count have not yet been finalized, results of previous years’ counts have.

And what past bird counts tell us is that almost all North American birds are under pressure by the changing climate to move northward. For example, in California the ranges of many bird species are now 200 miles north of their traditional habitats.

NOTE: There is a new international bird count in the works called the Great Backyard Bird Count. It will be held on February 18-21, 2022.

What does this have to do with hot gardens?

Yellow finch on Sunflower

Depending upon how severe the changes are in your area, birds that formerly ate pesky or damaging insects may be long gone. New species may arrive in your neighborhood from further south, but they may have different diet needs. It may be that the newcomer birds are seed eaters or leaf-lovers like the Yellow Finch in this photo, rather than bug eaters.

For other birds the impact is more complex. As an example, take the Cactus Wren which makes its home in saguaros. In the Saguaro National Park, the saguaros are now “moving uphill”–growing at higher elevations on the hillsides. According to a SNP naturalist the saguaros will only grow within a specific elevation range and no higher. They are close to that maximum elevation now and their range has become much narrower. So as the older cactus die out at lower levels that means fewer homes for Cactus Wrens and less food for saguaro pollinators like the white wing dove and the long-tongued Mexican bat.

So what’s a hot gardener to do?

Well, I’m not going to recommend that you build a bat-house in your back yard. (And–yes–there is such a thing as a bat-house as you can see in the photo on the left taken at the Tucson Mission Garden.)

New Year’s Resolution No. 1: feeding the birds

But hanging a bird feeder, especially if you live in a winter-snow part of the desert, and keeping it stocked can help birds in your area. Mourning doves, like the ones shown at the top of this post, have moved northward and definitely need food help surviving over winter.

Resolution No. 2: plant a large shrub or two

While almost every environmental group is recommending planting large trees to shade the earth, I think water-wise shrubs--large ones like Desert Willow (Chilopsis linearis) in its shrub form or a fast-growing Photinia (Photinia x fraseri)–provide better nest habitat and shelter from predators for birds as well as adding cooling shade to your hot dry garden.

For whatever it is worth, Mourning Doves have made a home in a Mexican yellow oleander (Cascabela thevetia) in my back yard for years as you can see in the photo at the top of this post. I don’t recommend planting a Thevetia, however, because it is highly toxic to humans, but the Mourning Doves don’t seem to mind. And I love to wake up in the morning to their calls.

So make planting a bird-friendly shrub one of your New Year’s Resolutions.

Resolution No. 3: keep tabs on what’s happening

Set up a free gardening blog/journal online and post something daily to keep track of how your garden is changing as the climate changes.

What to post? To make it easy, keep it short. So how about…
– a single flower photo
– a sentence or two about what is new in your garden
– notes of dates you installed plants or planted seeds
– a picture of your Little Free Plant Stand
– a photo of children playing in the garden or
– snow covering everything

If posting daily is too much for you, post weekly.

You will have to pick a name for your online journal/blog and I’d recommend that you include your location in that name. For example: CatherinesLasVegasGarden or SamGardensinSydney.

And keep this in mind: this online gardening blog/journal is primarily for yourself to help keep track of changes caused by climate change, so don’t be concerned about having or building followers. That can end up taking all your gardening time and then some! Interested people will eventually find what you are posting and enjoy it. Free blogs are available at WordPress.com and other sites.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Visit my author’s site to see the books I’ve published.

What NOT to plant for fire season

I have always loved what I call the “Tucson Gardening Style“. No broad swathes of grassy lawn browning in the sunshine. No water-guzzling attempts at English flower garden borders limp in the heat. Just native plants left where they were growing before any house was built: prickly pear cacti squeezed side-by-side with creosote bushes and saguaros and agaves and chollas and mesquites. And most of the time these Sonoran desert natives grow right up to the side of the house.

But on June 5th, after the Bighorn wildfire burst into life north of Tucson, this native plant gardening style suddenly seemed less charming and more threatening.

At first the Bighorn fire was just billowing smoke high up in the Santa Catalina Mountains. By June 9 when I drove around northern Tucson to to take photos for another blog, I began to realize an inferno would result if this fire reached down into the upscale Catalina Foothills neighborhood which had only hours before been designated as a threatened evacuation zone.

As I took a few pictures I also realized that in California, where I used to live, the “Tucson Gardening Style” would bring the fire service knocking at the door armed with chain saws and big fines. The law in California is that there must be a 100 foot cleared open space around a home and it is aggressively enforced.

There is, however, such a live-and-let-live “Nobody’s going to tell me what to do” outlook by many Arizonans that it is unlikely that type of regulation would ever be passed here.

Okay, while I live in Arizona now I’m going to ignore local attitudes regarding plants because wildfires happen here and throughout the Western United States. Here are some recommendations about garden plantings to help prevent your home turning into an pile of burnt rubble from an urban or wild fire.

First, clear plants away from the sides of your home and other buildings. Don’t let any shrubs or trees touch or almost touch a building. If the plants catch fire — even if ignited by sparks from a neighbor’s BBQ instead of a wildfire–your home could burst into flames before you even notice it.

While many trees suitable for hot dry climates have oily leaves, the Australian-native Eucalyptus trees are among the worst. Sure, they smell so good, but they are 50 foot high torches just waiting for a little spark to light them. As much as they seem to be great trees for hot dry climates (fast growth, low water usage, lovely dappled shade), they are not. As witness: the massive fires racing through the Eucalyptus forests of Australia in recent years.

I have also seen palm trees burning as 50 foot high torches in Los Angeles during an urban fire, but while embers fell from the palms, they did not seems as potentially dangerous as a flaming eucalyptus with its branches whipping in the wind casting sparks all over the area.

For very a different reason don’t plant a Cottonwood, a major water-sucking plant. Again, it is a fast grower, but will guzzle every drop of water in the ground around it and deprive other plants of water, leaving them tinder-dry. Cottonwood roots will also invade your plumbing and septic systems.

One grass is on the Do Not Plant list:

Buffelgrass (Cenchrus ciliaris L., or Pennisetum ciliare L.) is often called white fountain grass. An African native, it grows and blooms quickly, then dies back to leave dry, quick-burning fields waiting for a lightning strike to start burning. This grass, a threat to native plants including Arizona’s famous Saguaro cactus, has been mentioned as a key factor in the origin of the Bighorn fire. You can view a new webinar on the topic of buffelgrass damage to the Saguaro National Park .

Red Fountain grass does not spread wildly like White Fountain Grass. And it looks lovely when the wind blows.

Instead of Buffelgrass, consider Red fountain grass (Cordyline) which is less invasive and stays where it is planted. The much larger South American-native Pampas grass (Cortaderia selloana) will also stay where it is planted in a desert climate, but not if there is a pond or stream nearby. In that case it becomes invasive forcing out native plants.

Now onto something more positive. While the evidence is anecdotal, a few homeowners have sworn that their huge water-logged agaves saved their homes during a wildfire. I’ve seen the photos and the agaves encircling the homes look as if they have melted, but the houses were spared. It’s important to note that there was a cleared space between the house and the agaves and beyond the agaves, too.

As for planting any trees or agaves, wait until fall. It is too hot now and there is a great risk that anything you plant will die of heat at this time of year no matter how much you water it. Don’t let the landscape guy tell you otherwise!

The Bighorn fire is still burning on June 19th, but because of a wind shift, it is moving northeast, away from Tucson proper. A photo of it taken yesterday is at the top of this post. According to reports over 3,000 Saguaros have already been destroyed, but–happy news–most of the wild animals in the fire path, including baby mountain goats, have escaped. And there has been no loss of homes or human life so far.

Here is what happens to an SUV when the Forest Service makes a Phos-Chek drop. It’s that red stuff fixed wing airplanes drop on the edges of fires.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Texas Rangers are the earth’s “Thank You” to the monsoon

In recent weeks TV weathercasters in the desert Southwest have been laughingly referring to the “non-soon” as the annual summer rains got held up in West Texas. And, to make it worse, even fewer clouds came out of the Sea of Cortez. No rainstorms from either direction. Finally in late July one storm dropped enough rain to begin bringing Texas Rangers (Leucophyllum fructescens) into bloom.

Texas Ranger Leucophyllum frutescens in bloom

Since then even record setting temperatures have not slowed the rush to flowering by these heat loving shrubs, native to the Chihuahua desert. They are a visual joy in blue, purple, lavender, and white!

Texas Ranger untrimmed
Thanks to Starbucks in Marana AZ this Texas Ranger has been left untrimmed, although perhaps with too much shade on the plant. It prefers full sun.

Better yet, as SW natives the Texas Ranger thrives in very alkaline soil of .8 to .9 pH. While these 8 foot to 10 foot tall shrubs bloom in concert with the monsoon, they prefer fast draining soil to keep their roots almost dry so be sure to add plenty of organic material when you plant a Texas Ranger. And only irrigate them–lightly, if at all–during the summer months. Stop watering at the end of the monsoon in late September. And as for fertilizer? None needed at all. Fertilizer makes them spindly and weak.

NOW FOR MY RANT: Do not trim Texas Rangers into lollipops! Commercial groundskeepers seem to be the worst offenders of this practice, as you can see in the photo below. Texas Rangers have a beautiful loose shape and should be allowed to keep it. If you feel you absolutely have to cut back a plant, do it in March–one time during the year, only once! Or maybe plant a dwarf “compacta” variety instead. END OF RANT.

improperly trimmed Texas Rangers shrubs
These 4 Texas Rangers in a parking lot have been severely trimmed. Whoever developed the horticulture plan for this commercial area should have chosen the Leucophyllum frutescen ‘compacta’, the low growing variety of the plant.

Amazon Burning- what you can do

The new President of Brazil ran on a platform of developing the Amazon. What we are all seeing now is that landowners, particularly cattle ranchers, took that to give them a greenlight to start burning their way deeper into the life-giving jungle after he took office.

Now we can all be outraged as Presidents Macron and Trudeau have been on Twitter or we can actually do something about it in the real world. Countries like Pakistan, India, China, Senegal, Nigeria and even tiny Nepal have already embarked on programs to plant millions of trees.

While we can have no hope of getting support from the current administration in Washington D.C. for a massive tree planting effort in the U.S. I am confident that local groups, like the Tree People in Los Angeles or the National Forest Foundation, will continue and expand their Plant-A-Tree programs in cities, towns and forests across the country.

Crepe myrtless in bloom

If no organization near you is doing it at the very least plan to add a tree to your garden this fall when planting season begins. If every person in the U.S. planted just one tree we would have 329 million new trees which would help offset the damage being done right now in the Amazon.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Red and green for holiday color in a hot dry garden

If you had planted  “Wonderful” pomegranate shrubs last Spring, and did not harvest the fruit this Fall, you would have plants in your garden that appear to have big, brilliant red Christmas tree ornaments on them.  Of course, the leaves on your pom shrubs would have turned a glorious gold then fallen, so your red “ornaments” would be on bare branches now.  

Mother Nature’s holiday ornament!

If you are thinking of adding a pomegranates to your garden in Spring, you will be happy to know they are very drought tolerant, as you can read here. The name “Wonderful” designates one of the best varieties of pomegranates for private gardens.

If you are reading this post in Australia or elsewhere in the Southern Hemisphere, pomegranates bear fruit from March to May, rather than from September to February as they do in the U.S. Southwest.

Among the other plants that will give you green and red during the holiday is the very drought tolerant Heavenly Bamboo, (Nandina domestica), which has bright red berries, reddish leaves and is not a bamboo at all.  I am not a big fan of the shape of this plant; it looks too much like a cluster of sticks to my eye…but nonetheless I do love the winter color and the fact that it will survive with considerable neglect.

This Heavenly Bamboo (Nandina domestica) is beginning to change from summer green to winter red.

Surviving considerable neglect is also a prime characteristic of the sturdy bottle brush, another plant that I do not care for–well, I don’t like the big tall ones with red blooms that are used as center barriers along freeways in California. 

Dwarf bottle brush “Little John” as a low hedge beside ice plant in a very drought tolerant planting in Grand Park in downtown Los Angeles.

BUT I really love the dwarf bottle brush variety Callistemon ‘Little John’ which is very suitable for home gardens. Instead of primary colors of plain red and plain green, this low-growing shrub has a blueish-grey cast to the leaves and a burgundy color flower.  

This drought-tolerant, dwarf Callistemon “‘Little John’ grows slowly, rarely needs any pruning and is colorful in Fall and winter.

Now there is one other color for the holiday season and that is white, as in white Amaryllis, the ones that you force for winter.  They are big and bold and can be transplanted into a sheltered corner of your hot, dry garden to bloom again year after year.  I did exactly that in Las Vegas, but the next bloom came over a year later near Easter, rather than Christmas. Since then it has bloomed regularly in the Spring.

And be sure to put luminarias out for the holidays to line your patio or walkway.  The old-fashioned way to do them is put tea lights inside paper bags. On Amazon the manufacturers state that the bags are fire resistant. If you can find them I’d recommend terra cota luminarias, some of which are battery powered, and you can use them year after year.

Finally…I am moving after the first of the year so I will be publishing this blog only on an irregular basis until I am settled into my new home. Happy New Year to you!

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting

Is that plant dead? Should I replace it now? Tips for Fall planting

Mother Nature plants in the Fall and so should you.  Instead, however, of simply deciding which trees, shrubs or perennials to add to your arid garden this Fall, you may be looking at which plants you need to replace. The record-breaking heat in the Southwest and California (and Australia!) this last summer baked the leaves on many plants and turned them brown  overnight. On others the leaves simply fell off the branches. The plants appeared dead.

Azalea regrowing after sunburn
After looking as if nearly dead, the cooler weather has brought new growth to this white azalea which thrived for years in a micro-climate backed up against a wall in almost total shade.

But don’t yank these sunburned plants out of your garden yet, especially now that the rains have come. Wait two or three weeks. The roots of dead-looking plants may have survived the heat and be ready to regrow.

If, however, you decide to replace some plants, consider the suitability of the ones you choose for replacements. The heat this last summer will probably be back next year and for many summers to come.  You may want to select more desert-like plants or take steps now to create micro-climates for parts of your garden that suffered most from the heat by adding shade-producing and heat-reducing plants.  And, unlike the Beanstalk of Jack-and-the-Beanstalk fame, the plants to create micro-climates don’t grow sky high overnight. Planting them this Fall–rather than waiting until Spring–will give them a head start on growth over the winter.

Plant now to create micro-climates in your garden

For starters you can help cool off your entire garden by planting a fast-growing hedge in front of a hot wall. This can be effective with both cement block walls around your property and  the stucco walls of your home. The shrubs’ leaves will block the sun from heating up the wall during the day so there will not be as much drying heat to be released after dark.  Overall your garden will feel cooler and a bit less dry.  And a cooler, slightly damper garden is better for all plants — and people.

Two drastically different hedge plants that grow fast are Pampas Grass (Cortaderia selloana) and Japanese privet (Ligustrum japonicum).

pampas grass
Behind this Pampas grass is a dull gray block wall. In one year it was covered up.

Pampas grass is close to being a Jack-and-the-Beanstalk plant. It will shoot up to as tall as 20 feet in one year, and should be cut back to 18 inches high in mid-winter.  But be aware: its blades have rough edges that can cut skin so wear gloves when cutting it back. And it may be very difficult to remove if you change your mind later. It is definitely a statement plant.

Ligustrum japonicum privet hedge in bloom
In Springtime the Japanese Privet hedge bursts into bloom.

The Japanese privet is more ordinary looking–just a basic green hedge.  It grows about two feet a year, however, and is quite drought tolerant. Poor soil conditions do not seem to bother it either. In Spring it is covered with white flowers that look almost like lilac blooms, but don’t smell nearly as nice as lilacs. You can see these and other shrubs for hedges in arid gardens here.

Planting a tree for more shade is another way to create a micro-climate to help other plants in your garden survive in hot weather.

Chitalpa taskentensis flowers in summer Hot Gardens

One rapid growing tree that is suitable for arid gardens is the Chitalpa (Chitalpa tashkentensis) which will grow about 3 feet a year to a maximum height of 25 feet.  It is a hybrid of the Desert Willow and the Catalpa tree that was created specifically to thrive in hot, dry climates.  While it likes balanced soil, slightly alkaline conditions will not impair its growth. I especially like it because it has long-lasting, pretty pink-white blossoms, an open branch structure and provides dappled shade, rather than dark shade. You can see other trees for hot, dry gardens here.

The right way to plant a tree or shrub

The hole for planting should be 2 1/2 times as wide as the root ball, but do not make it deeper than the root ball.  The crown (the part where the roots meet the trunk or main stem) should be at or slightly above ground level–not submerged in the hole.  Be sure to add a lot of rich organic mulch into and around the hole you dig for a new tree or shrub to provide nutrients for growth, especially root growth during winter.  Really soak the soil with water around the planting hole and, once planted, water the tree regularly until the plant is established.

Now here is one last recommendation for coping with our hotter, drier summers and the damage of relentless heat. In my last post I wrote about applying organic mulch around plants, trees,  and in flower beds to help supply nutrition. Another benefit of mulching  is that mulch provides an insulating layer to protect the roots from scorching summer heat and winter cold.  That’s right — winter cold and its potentially damaging effect on plants is right ahead of us now. More about this in an upcoming post.

Our 8 most popular newsletters

  1. Where to get free or cheap trees for your garden
  2. Six distinctively different landscapes to replace a lawn
  3. Cover up that naked wall
  4. Five fragrant plants for your garden
  5. Nine trees to combat climate change
  6. Four desert trees good for soil, 4 toxic ones
  7. Plants that bloom even in mid-summer scorching heat
  8. Follow 90F degree rule for planting