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Carissa macrocarpa (Natal Plum), is a shrub native to South Africa, where it is commonly called the Large Num-Num. In Zulu, as well as in the Bantu tribes of Uganda, it is called amatungulu. In Afrikaans the fruit is called Noem-Noem.
C. macrocarpa deals well with salt-laden winds, making it a good choice for coastal areas. It is commonly found in the coastal bush of the Eastern Cape and Natal. It produces shiny, deep green leaves and snowy white flowers whose perfumed scent intensifies at night. Like other Carissa species, C. macrocarpa is a spiny, evergreen shrub containing latex. They bloom for months at a time. The ornamental plump, round, crimson fruit appears in summer and fall at the same time as the blooms. In moderate, coastal areas the fruits appear through the year. The fruit can be eaten out of hand or made into pies, jams, jellies, and sauces. Some claim that other than the fruit, the plant is poisonous.
Carissa macrocarpa is quite easy to grow. Its seeds germinate 2 to 4 weeks after sowing. The development of the seedlings is very slow at first. Plants cultivated from seeds are bearing fruits within the first 2 years. A vegetative propagation is possible and preferred. The most efficient method consists of notching young branchlets by cutting them halfway through. Then they are bent downwards and allowed to hang limply.
After the young branchlets have built a callus, in approximately 2 months, the cutting has to be removed from the parent and planted in sand under moderate shade. Roots form within one month. Carissa macrocarpa will produce fruits within the first 2 years applying this reproduction method.