Moss Rose (Portulaca grandiflora) Common names: Moss-rose, Moss-rose Purslane. Annual flowering, succulent groundcover. Zones: 2 - 11. Height: 4 - 8 inches. Width: 6 - 12 inches. Bloom time: June - Frost. Bloom Color: Red, Rose, Orange, Yellow and White. Light: Full Sun. Water: Dry - Well Drained Soils. Good for Dry soils. Edging, ground cover, rock gardens, containers. Native Range: Argentina, southern Brazil, and Uruguay.