Thunbergia alata Black-eyed Susan; 7°C/45°F; Tropical Africa

Rather thin, spindly plants whose leaves are not particularly attractive, but the brown-centred orange-yellow flowers are produced in abundance throughout the summer. They may be encouraged to trail or climb, and can be planted out of doors against a sheltered wall for the summer months. Raised from seed sown in a warm propagator in the spring, they should be gradually potted on until they are in 15-20cm/6-8in pots of a good loamy soil. Once established in their final pots they will need to be watered and fed regularly to keep the flower production constant. Throw out once all the flowers have faded.

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