yellow flowering tree
‘Desert Museum’ Palo Verde

One of the most popular trees for arid climates is the ‘Desert Museum’ Palo Verde. Once you see one, it’s easy to see why it is present in so many residential, commercial, and community areas.

Its medium-green trunk, feathery foliage, and golden flowers, that appear in late spring, add beauty to any landscape. Another characteristic of this palo verde tree is that is has a moderate to fast rate of growth. The branches lets in enough sunlight so many plants can grow underneath its canopy.

BUT, there is another side to these lovely trees that may dissuade people from growing them and that is wind damage.

Fallen ‘Desert Museum’ Palo Verde trees after a monsoon storm

I’ve heard murmurs from people who don’t want to plant these trees any longer because of their susceptibility to damage from high winds.

However, most of these problems are caused by improper maintenance, poor location, and not selecting the right ‘type’ of Desert Museum palo verde.

Desert Museum Palo Verde tree in my backyard

I have three ‘Desert Museum’ palo verdes around my house. They range in age from 10 to 20 years old. In all that time, I have not lost a single one. Of course, there has been a couple of instances of branch breakage, but the trees recovered nicely. Broken branches is a natural part of life with trees – particularly those native to the desert.

So, how can you enjoy the beauty of this tree while lessening the danger of wind damage? As a retired certified arborist, I’m here to tell you that there are definitely things you can do.

5 Strategies for Structurally Healthy ‘Desert Museum’ Palo Verdes:

1. Water deeply to a depth of 3 feet. Deep roots are key to the stability of a tree and also decreases the chance of uplifting roots. Apply water toward the outer reaches of the branches where the roots are concentrated. As a tree grows, there roots move outward, so move your drip emitters or hose as needed.

Be sure to plant in an area where there is adequate area for root growth. Parking lot islands and narrow areas don’t allow enough room for roots to anchor the tree.

‘Desert Museum’ palo verde that has grown too rapidly due to excess irrigation

2. Irrigate less frequently avoid your tree growing too fast. This is a big cause of wind damage with palo verde trees. It’s important to remember that they are desert trees and don’t need as much water as other plants in the landscape. But, people often overwater their desert trees, which causes them to grow too quickly. This causes the formation of weak wood because they haven’t had the time to grow strong trunks and branches. In the photo above, notice how thin the multiple trunks are.

Established native desert trees, that have been in the ground for at least 3 years, can follow these general guidelines – water 1 to 2X a month in spring/fall, 2 to 3X a month in summer, and monthly in winter. These guidelines are for our current drought situation but can be modified as needed.

Trees that have been pruned up too high (lion-tailing)

3. Prune your tree correctly. There are examples of awful pruning. One common one is known as ‘lion-tailing’ which is when trees have been over-pruned so the majority of the tree is devoid of branches except for the very top. This pruning deprives the branches of foliage needed to produce energy for the tree and to increase tree strength. It also increases the amount of overhanging branches toward the top making the tree more likely to fall.

Many landscapers don’t know the right way to prune trees and can inadvertently cause harm to your tree. I highly recommend enlisting the services of a certified arborist to prune your tree correctly.

4. Select a multi-trunk form of palo verde instead of one growing on a single trunk. Desert trees naturally in a multiple trunk form, which distributes the weight of the upper branches. Palo verde trees that have been trained to grow on a single trunk, are under more stress from the wind with their heavy top half. The majority that you see fallen have been trained into a single-trunk tree.

This tree needs pruning before the monsoon season to lessen the weight of the canopy

5. ‘Desert Museum’ palo verde trees generally need pruning at least once (sometimes twice) a year. You want to be sure to prune them before the onset of monsoon season – removing any heavy weight or branches that are weakly attached.

Newly-pruned ‘Desert Museum’ palo verde tree ready for the monsoon season

Palo verde trees are a great choice for the desert garden that add welcome beauty and shade. If you have a ‘Desert Museum’ palo verde (or other native desert tree), I encourage you to follow these tips to help ensure a beautiful and stable tree for years to come.

Want to learn more about this and other palo verde tree species? Check out my previous blog post here.

 

Noelle Johnson, aka, 'AZ Plant Lady' is a horticulturist, certified arborist, and landscape consultant who helps people learn how to create, grow, and maintain beautiful desert gardens that thrive in a hot, dry climate. She does this through her consulting services, her online class Desert Gardening 101, and her monthly membership club, Through the Garden Gate. As she likes to tell desert-dwellers, "Gardening in the desert isn't hard, but it is different."