Quick Guide: summer, tender, full sun, height: 3m/10ft, width: 4.5cm/18in

Native to South Africa, Thunbergia alata or black-eyed susan is a twining perennial grown as an annual in less favoured climates. It bears numerous funnel-shaped flowers of deep yellow with a black centre. Black-eyed susan can be grown on a sunny patio in a large pot, trained up a wigwam of canes which it will quickly obscure.

GROWING A position in full sun is essential, with fertile, moist soil. Plant against a wall, fence or post with the support of strings, wires or netting. Water in dry spells and discard after flowering.

PROPAGATION Sow seeds under glass in spring in small individual pots. Harden off and do not plant out until night temperatures exceed 10°C/50°F.

VARIETIES `Susie', hardier than the species, profusion of yellow, orange
and white flowers; `Alba', white with black eye.

POSSIBLE PROBLEMS Generally trouble-free.