Because of this, it is found in the upland areas of the desert where the soil is more coarse. These trees occur thought out the Sonoran Desert except in the driest regions. These trees can live to be more than years old, possibly as old as years. It is considered a large shrub or a small tree standing about 15 feet tall on average, occasionally reaching as tall as 30 feet.
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The usually single trunk becomes gray and fissured with age, and the branches and twigs are a bluish-green. Fruits resemble flat green pea pods when young, becoming tan when dry. Blue palo verde grows in U. Department of Agriculture plant hardiness zones 9 through Smaller than blue palo verde, foothill palo verde Parkinsonia microphyllum is 20 feet tall and wide. It usually makes a multi-trunked tree and has yellow-green bark and leaves. Spring flowers are paler yellow than blue palo verde, and the fruit is slender with rounded lumps where the seeds form, resembling beads on a stem.
Fruits are green when young and brown when mature. Foothill palo verde is hardy in USDA zones 9 to The canopy of Jerusalem thorn Parkinsonia aculeata is wispier and more open than other palo verdes. In spring, new leaves have a long, slender rachis with small pinnate leaves along the sides. Later, the leaflets drop, leaving only the whip-like green rachis, which fall off before winter. Fragrant bright yellow flowers have an orange splotch on the banner petal.
The bark and foliage are bright green, but mature tree trunks become gray. The branches have significant thorns. Read more about the differences here. It's named after the Arizona-Sonora Desert Museum. According to a Los Angeles Times article , the name was created about thirty years ago when staff members at the museum began to notice thornless palo verde trees that bloomed throughout the summer.
The Foothills Palo Verde can live to be about years old. Some can even age up to years. The height and low-water maintenance of these trees makes them perfect for landscaping. Pick them when the pod is green and the seed tender. Eat them like you would peas or edamame. They've been know to be a little sweet. You can also wait to harvest them until the seed is fully developed and the pod is dry. At this stage they're best eaten sprouted. Learn more about the harvesting process here.
A story written in the Star in says most palo verdes cause few or no allergy symptoms. The pollen produced by the plant is sticky and heavy, making it difficult to travel far in the wind. However, the large quantities of dried fallen yellow flowers are known to do some damage.
Learn more about Arizona trees and allergies here. According to a Desert Museum fact sheet , the palo verde is the primary nursing plant for baby saguaros. ThisIsTucson is member-supported.
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