Psorothamnus arborescens, commonly known as Mojave indigo bush, is a deciduous shrub native to the arid desert washes, rocky hillsides, and open woodlands of the Mojave and Colorado Deserts, the Sonoran Desert, and the Great Basin in southwestern North America. It thrives at elevations between 330 and 6,230 feet. This plant typically reaches up to 3.3 feet in height and is characterized by its highly branching stems, which bear sharp thorns, and its small, compound leaves that are drought-deciduous, meaning they are shed during dry periods. The Mojave indigo bush produces bright purple, pea-like flowers that bloom from March to May, attracting pollinators such as bees. The flowers are followed by glandular legume pods that are also noteworthy.

The Mojave indigo bush is valued for its vibrant blooms that provide a splash of color in arid landscapes. It is often used in xeriscaping and as an ornamental in desert gardens due to its low water requirements and ability to thrive in poor, well-drained soils. It prefers full sun but can tolerate some light shade. This plant is also appreciated for its resilience and ability to provide habitat and food for wildlife in its native range. While it is generally low-maintenance, gardeners should be aware that it may require protection from overwatering and cold temperatures.CC BY-SA 4.0