Best of the bunch
●● Black-eyed Susan (Thunbergia alata)
This much-loved perennial climber produces a profusion of black-centred orange, yellow or creamy vanilla flowers into the autumn if it is given the right conditions.
Ideally grown in a sheltered spot, in a porch or conservatory, it will thrive under cover, climbing to 1.5m (5ft) in a short time and should survive winter in a cool greenhouse.
Alternatively, grow it as an annual outdoors to climb up posts and obelisks in a sheltered spot, shaded from the hottest sun and use it to provide instant colour while more permanent climbers are becoming established.