Hibiscus sabdariffa
FRUIT TREE-ROSELLA a native of tropical West Africa, is an attractive annual shrub to 1.5 m high with large, lobed reddish leaves & attractive yellow hibiscus-like flowers that prefers warm climates. They are easy to grow, with no pest problems, hardy & prolific. Most soil types are suitable if they are rich and well-drained. Plenty of water is needed to maintain growth, flowering, and fruit progress, mulching is beneficial.
Rosellas need at least 5 months frost-free to bear & need a very warm soil to germinate, preferably over 25°C. In southern areas of Australia, this would be as late as October outside. Some years the soil might take even longer to warm up. So gardeners in cooler areas need to start seed indoors using a small bottom-heat unit, or the top of the water heater. Plant several seeds 50 cm apart and thin seedlings to the strongest.