Thunbergia gregorii

Plant of the month: October

Thunbergia gregorii

Also known as: orange clock vine

Native to: tropical East Africa

Blooms: late spring to autumn

Habitat: edge of warm temperate forests

Where found at Birmingham Botanical Gardens: Mediterranean House


This tender, vigorous, evergreen climber belongs to the Acanthus family; Acanthaceae. It is closely related to ‘black eyed susan’ or Thunbergia elata. The common name of clock vine relates to the vine spiralling upwards in a clockwise direction. It grows to 2.4 to 3.5m tall, or if left without support can become an extensive ground cover. Its bright orange flowers, 4.5cm across are attractive to bees. Hardy to -1 C, Thunbergia gregorii flowers more profusely and even year-round in warmer climates, while restricted to summer and autumn in cooler climates. It prefers a sunny spot with plenty of air movement. Propagation is by cuttings taken in the summer or by seeds sown in the spring.