Ground Morning-Glory
(Convolvulus mauritanicus)
 
Evergreen grows 12 to 24 inches tall.  Lavender-blue, 2-inch wide, trumpet-shaped blooms stay open all day to provide a colorful cover.
 
Zone: 8-10
Light: sun or light shade
 
Comments
Performs best in Southwest and on West coast.  Useful to cover hot, sunny, slopes but is not a thick ground cover.  Tolerant of different, well-drained soils.  Space plants 24 to 36 inches apart.  When plants get scraggly, prune in early spring before growth starts again.  Can root from cuttings taken from established plant in spring.  Or, start it from seeds.