Portulaca (moss rose)

 

Height: 4-8 inches
Flowers: 1 inch wide
Position: Full sun
Soil: Average to dry soil
Planting out: Once soil has warmed
Spacing: 12 inches
 
The soil should be of poor fertility, sandy, and well drained. Portulacas are the ideal plants for spots that just don't get enough water.  As long as the location is sunny, these plants will do well with minimal care.