When open the flowers can nearly hide the foliage. The solitary flowers open from small buds (L) and may be single (C) or double (R). They are only open in bright sunlight, closing at night and on cloudy days, but most of the newer hybrids will remain open throughout the day. The saucer-shaped, rose-like flowers are produced on the stem tips, held facing up above the foliage, opening from buds that resemble little popcorn kernels.
The low-growing plants form a mat up to a foot across and 3 to 8 inches high arising from the central fibrous root system. oleracea and hybrids with that species have flat leaves.The stems can be somewhat fragile and break easily (although broken pieces will root if the soil is moist enough). They are up to an inch long and are arranged alternately or in small clusters along the reddish, multi-branched prostrate to slightly ascending stems. The bright green leaves are oblong to cylindrical with pointed tips. Moss rose is a semi-succulent plant that stores water in its fleshy leaves and stems. Moss rose has fleshy, succulent leaves and stems. grandiflora, but many cultivars are likely hybrids. In the ornamental industry moss rose may be listed as P. oleracea), and like that plant has escaped to naturalize in some parts of the country on roadsides and in waste places. This herbaceous plant in the purslane family (Portulacaceae) is cultivated throughout the world as a garden annual for its showy flowers that bloom all summer long with little care.
Moss rose, Portulaca grandiflora, is a drought and heat tolerant annual native to hot, dry plains in Argentina, southern Brazil, and Uruguay. Moss rose, Portulaca grandiflora, is a heat tolerant annual.
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