With the limited color range in gardens in hot, dry desert climates–usually shades of brown and muted greens–having a tree outside your window that blazes with reds, yellows and oranges in Fall is a happy choice.
(I have a warning for you about leaves turning yellow at other times of year…but more about that later.)
First, let’s look at 2 big, beautiful, drought-tolerant trees and a small one that signal the change of seasons with their leaves.
These drought-tolerant Chinese Pistache (Pistacia chinensis) trees are still young. When mature, they are excellent shade trees at 40 feet tall and about 30 feet wide. Every Fall their leaves on the male trees turn from summer green to yellow to gold to blazing red–often with all those colors on the tree at one time as you can see in the photo at the top of this post. The female trees simply turn golden yellow. Strictly ornamental trees, they produce small non-edible red berries.
The ‘Rio Grande’ cultivar of Fan-Tex ash (Fraxinus velutina) in this photo is about 14 years old. Not only is it a fast grower, it can be ideal for summer shade and winter warmth, after the leaves fall and the sun shines in. Once established, it is drought tolerant. While there are other ash trees that grow well in hot arid gardens — for example, the very fast growing ‘Modesto’ ash–only the ‘Rio Grande’ Fan-Tex ash leaves turn gorgeous gold in Fall. Click on photo to see it in summer.
And a colorful Fall and Spring tree for smaller gardens
If you do not have space for a very large tree, consider planting a crabapple (Malus) tree in your garden. They grow to about 15 feet wide and 15 feet tall. While needing regular watering, the crabapple flowers beautifully in Spring and the leaves turn a lovely orange/red in Fall. See second photo for spring blooms. If you should decide to buy one be sure to ask what the Springtime blooms look like. Some bloom white, some pink, some almost red and some are single blooms, others doubles. And the fruit is edible as a jam or pickle when cooked properly.
Beware of some yellow leaves
You may notice that the leaves on one of your shrubs are turning yellow — but the veins stay green–and it isn’t even Fall. This is an indication of plant chlorosis due to problems with soil conditions, specifically iron deficiency. There are commercial treatments you can use, like Kerex or other iron chelates and other spray-on treatments. They work short term. But improving the overall condition and chemical balance in the soil should be your next step after spraying for longer term results.
Listen to Mother Nature
Mother Nature plants in Fall and so should you. By planting at this time of year when the soil temperature has cooled off, the shrubs and trees have the opportunity to develop deep roots over winter and are, thus, stronger plants when they start to grow above-ground next Spring.
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