Howard F. Schwartz, Colorado State University, Bugwood.org
Common purslane grows extremely quickly in the summer when it's hot and sunny. It prefers the climate from May through September and tolerates compact soil and drought very easily. It's a summer annual and has green, rounded leaves throughout with younger maroon leaves closer to the soil. It has succulent foliage and small, yellow flowers in the summer, making it easier to identify among other grasses and weeds in the area.
Treating the area with a pre-emergent herbicide is the best way to avoid a common purslane infestation. Use an herbicide with dithiopyr to prevent emerging seedlings. 2,4-D herbicides are also helpful and provide lasting control. Proper turf maintenance in the area, such as irrigation and mowing, will help to keep purslane from reappearing.