Trailing Dalea. Dalea greggii, Legume or Pea Family ( Fabaceae ), Trailing Dalea. Also Called: Trailing Indigo Bush, Trailing Smoke Bush, Gregg's Dalea, Gregg's Prarie Clover, Prostrate Dalea. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Trailing Dalea is an evergreen perennial, fast growing, 5 to 10 feet spread. Trailing Dalea's low height and small, silvery, blue-green leaves make it an attractive, easily established, low-maintenance groundcover for dry sites. It grows 12 to 24 inches high and roots at the nodes of long, trailing stems; it is useful for stabilizing slopes and rocky areas in poor soil where erosion control is needed. Like most daleas, Trailing Dalea doesn't need fertilizer. In winter, do not overwater, although in the summer supplemental water will help keep the foliage full. It has purple pea-like flowers on short spikes which are not noticeable from a distance but are attractive up close. It is a tough ground cover which thrives in full sun and reflected heat locations. It forms a dense silvery mound up to one foot tall by 5 - 10 feet wide. It's fuzzy purple flower balls produced in the spring and early summer are not too showy, however honeybees like them. Quick Notes: Height: Height about 1 - 2 feet. Spreading about 5 - 10 feet. Flowers: Spikes of small rose-lavender to purple flowers. Flowering Time: Mid February - April. Leaves: Evergreen gray - green compound leaves. Found: The USDA claims it is native to the USA (NM, TX). We see it throughout lower elevations in Arizona as a landscape plant. It is also native of the Chihuanhuan desert; from northern to central Mexico. Hardiness: USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 to 4,900 feet In Arizona. Habitat: Native to Rocky limestone hillsides. Chihuanhuan desert; elevations of 2,000-4,500 feet. Miscellaneous: Flowering Photos Taken March 12, 2006. Sun City, Arizona. An ideal xeriscape landscape plant in Arizona.