The Portulaca grandiflora cultivars are so much more beautiful than the P. oleracea varieties- the succulent, cylindrical leaves provide a beautiful, fine-textured accent, and a foil to the beautiful double, color-saturated 'rose-blossoms', which cover the plant. The only downside, in my opinion, is the fact that the flowers do not stay open for long- often for only half a day- but the plant breeders are gradually increasing the length of time of the floral display, and most new cultivars have flowers that stay open for most of the day.