Roselle is a robust many-branched shrub-like annual that gets 4-7 ft (1.2-2.1 m) tall and almost as broad. The dark green leaves are about 6 in (15 cm) across and deeply dissected into 5 narrow lobes. The stems, branches, leaf veins, and petioles (leaf stems) are reddish purple. The hibiscus-like flowers, appearing in October, are yellow and about 3 in (7.6 cm) across. At the bottom of each flower, enclosing the bases of the five petals, is a fleshy bright red cup-like structure called a calyx, The calyx is about 1 in (2.5 cm) in diameter. The calyces of roselle are used to make juices, sauces, jellies, wines and pies. Originally native to tropical Africa, roselle is grown in the subtropics and tropics worldwide and has escaped cultivation and become naturalized in tropical America and Asia. Roselle is susceptible to root knot nematodes, so you may not be able to grow it in the same place year after year. You should mulch well to punish the nematodes and to conserve water in the soil. No matter when you plant it, roselle will not bloom until days begin to shorten in October. Roselle prefers full sun.
Hibiscus sabdariffa - Floridata, http://www.floridata.com/Plants/Malvaceae/Hibiscus%20sabdariffa/498 (accessed January 26, 2017).