Rock Purslane in an incredibly versitile succulent.  The advantages are many, such as the ability to be grown in pots or in the ground, incredibly drought tolerant, seacoast tolerant, long bloom periods, and easy maintenance.  It's also one of the few plants that can be grown beneith Oak trees, with the caveat that it does receive some filtered light.  Calandrinia will grow up to about 2.5 feet tall in most conditions with equal spread.  Hardy to about 25 deg. F.  One of our favorites!