Portulaca grandiflora is a succulent flowering plant in the family Portulacaceae, native to Argentina, southern Brazil, and Uruguay and often cultivated in gardens. It has many common names, including rose moss, eleven o'clock, Mexican rose, etc.
Portulaca grandiflora is commonly called moss rose, which is quite descriptive of this plant’s key ornamental features: ruffled, rose-like flowers (to 1” diameter) appearing on prostrate to slightly ascending stems that form a moss-like foliage mat. This annual is a succulent that typically grows to 6-8” tall and spreads to 12” wide or more. Flowers bloom summer to frost and come in single, semi-double or double forms in colors including red, rose, orange, yellow, white and pastel shades thereof. Flowers do not open on cloudy or rainy days. Cylindrical, fleshy, medium green leaves (to 1” long) appear in clusters along reddish stems.