Olneya tesota-Desert Ironwood
This Sonoran desert native has attractive gray bark. Frost or
drought can induce leaf drop. Summer monsoons can trigger
regrowth. The stems are armed with vicious thorns. In
spring, there are masses of lavender pea like flowers. This tree
needs no water in deep soil. The seeds are edible. Leaves
are 2" long and 1" wide. Do heavy pruning only in cooler months.
It is native < 2500' in sandy washes. Give some frost protection
when young. Mistletoe can infest.