Tamarix sp.

Extremely invasive and threatens fragile riparian corridors across the southwest. Tamarisk reduces native seed germination because of the salts it concentrates on the soil surface. Tamarisk outcompetes and eventually replaces cottonwoods, willows, and mesquite, which in turn impacts wildlife habitat. Not commonly sold, but occasionally
Also avoid:
Athel Tamarix aphylla

Desert willow Chilopsis linearis
A deciduous willow-like tree growing up to 30 ft, with slender leaves and long slim pods. Fragrant, trumpet-shaped, pink to lavender flowers attract hummingbirds and other pollinators. Desert willow blooms throughout the spring and summer and grows fast with supplemental irrigation.

Desert ironwood Olneya tesota
The most drought-tolerant of our native trees, growing up to 40 ft tall. The pink, white or lavender flowers are arranged in loose clusters that bloom in May and June. Pods containing edible seeds ripen 5-8 weeks later. The small gray-green leaves and upright form readily distinguish desert ironwood from other desert trees. An important “nurse” tree for saguaros and other plants, ironwoods also provide shade for desert animals.

Also try:
Baby bonnets Coursetia glandulosa
A large, airy, thornless shrub with delicate pea-shaped white, yellow
and pink flowers.