The Gregg's prairie clover, or indigo bush, is a sub-shrub with an average height of 4-9 inches and a spread of 2-4 feet. The shrub is mainly grown for its silvery, blue-green, delicately compound leaves, but in spring and early summer, it blooms with purple pea-shaped flowers.

Trailing Indigo Bush is a long-lived, durable, evergreen ground cover that requires almost no maintenance. It forms a dense silvery mound of foliage and blooms with fuzzy purple flowers in the spring and early summer, attracting bees. It tolerates reflected sun and harsh conditions—plant in well-draining soil; it is susceptible to root rot with overwatering. 

This plant is a good ground cover for rocky slopes and exposed sites in the Southwest. It is primarily grown for its foliage but blooms purple in the summer. The plant is well adapted to dry conditions.