Thunbergia is a vigorous climber which is usually grown as a summer annual and will quickly cover a trellis, usually growing to 120cm (4′). It can also be kept as a houseplant, and either trained up a tripod of canes or as a hanging plant in a basket.
Soaking the seed for 24 hours before sowing will speed up germination but is not essential.
Fill the seed tray with good quality John Innes Seed compost.
Stand the tray in a tray of water and leave for 10 – 15 minutes until the compost is moist.
Sow the seed thinly on the surface and cover with a thin layer of Vermiculite, not compost, as they need the light to germinate.
Place in the propagator at a temperature of 20 – 25C (68 – 77F); they should germinate in 14 – 21 days.
Keep the compost moist but not sodden.
Prick out when large enough to handle.