'Emerald Blanket' Carissa (Natal Plum), Carissa macrocarpa 'Emerald Blanket' is a low growing cultivar that grows 1'-2' tall and 4'-8' wide. It is best planted in part sun to part shade, and is very drought tolerant once established. They produce small fragrant white flowers in the summer and a reddish fruit after; this fruit can be used to make jellies and preserves. This variety is a great choice as a groundcover or accent plant.