Seeds from Calandrinia grandiflora Rock Purslane. It forms a low mound of succulent leaves and branches 1′ tall by 3′ wide, above which rise numerous 2′-3′ flower stems from late spring to late summer. It is hardy to below 18ºF, and it’s early flowering means that it can be grown as an annual in colder climates. It grows best in full or part sun and well-drained soil. Zones 7-11.