Natal Plum. Fragrant star-like flowers and edible fruit. The oval fruit with tender, smooth skin turns to a bright magenta-red to dark-crimson, must be fully ripe and slightly soft to the touch to be eaten raw. Thorns make Carissa an excellent plant for barriers. Makes a good container specimen or bonsai. Carissa is subtropical plant, thriving throughout Florida and enduring temperatures as low as 25 F when well-established. Young plants need protection when the temperature drops below 29F. The plant has moderate drought tolerance and high resistance to soil salinity and salt spray.