Common name: 
Natal Plum
Carissa grandiflora
3 - decent flavor
Natal plum prefers a sandy, well-drained soil. It responds well to close pruning and is easily kept at any size. Many of the cultivars have a tendency to produce branches that revert to the species characteristics, so it may be necessary to prune frequently to prevent the cultivar from reverting completely. Natal plum does best and produces the most flowers when positioned in full sun, but it tolerates partial shade. Natal palm is drought tolerant. In zone 9 winters, Natal plum may freeze to the ground, but it usually comes back in spring. Natal Plum will tolerate a variety of soils and exposures and only needs light pruning. Useful as a screen or hedge, it should not be planted too closely to walkways where its large, forked thorns can injure passersby. It makes a nice, full foundation shrub. While it thrives in full sun, natal plum can adapt to fairly heavy shade and requires only moderate watering and fertilization. Plant on three to six-foot centers for a hedge or mass planting, closer for the compact cultivars
Propagate the cultivars of Natal plum from cuttings. The species may be grown from seed.
Dwarf cultivars such as 'Green Carpet', 'Horizontalis', and 'Prostrata' make excellent groundcovers.
Carissa macrocarpa

Drought tolerant: Yes

Edible Uses: fruit

Medicinal Uses: Vitamin C

Flood tolerant: No

Zone hardiness: 9

Family: Apocynaceae

Genus: Carissa

Physical characteristics: evergreen, flower, shrub, thorny
All parts of the plant are poisonous except for the ripe fruit. Natal Plum is susceptible to root rot when plants are overwatered [probably not flood tolerant then].