Thunbergia grandiflora ‘Alba’
White Sky Vine, White Bengal Clock Vine
Bloom Time: Mid summer to late fall
Thunbergia grandiflora ‘Alba’ is a vigorous, evergreen vine with thick tuberous roots from which emerge rope-like stems holding up to 5 inches (12.5 cm) long, dark green leaves that have a slightly toothed margin. From mid summer to late fall appear the beautiful, up to 3 inches (7.5 cm) wide, white, tubular, flaring flowers that are cup-like with pale yellow striped centers.
USDA hardiness zone 8a to 11b: from 10 °F (−12.2 °C) to 50 °F (+10 °C).
How to Grow and Care
Plant the Thunbergia seedlings along the base of the support. Space the plants 12 inches (30 cm) apart. Plant the seedlings at the same depth they were growing at previously.
Water Thunbergia deeply once a week, providing approximately 1 inch (2.5 cm) of water during irrigation or enough to keep the top 6 inches (15 cm) of soil evenly moist. The plants require less irrigation during rainy weather, and they may require twice weekly irrigation during times of dry, hot weather.
Guide plant stems to the support once they are long enough if they don’t begin climbing on their own. Thunbergia sends out tendrils that grip the support, so leaning the longer stems against the support forces the vine to begin climbing.
Cover the exposed soil in the garden bed with a 2-inch (5 cm) layer of mulch. Mulch retains soil moisture and suppresses most weeds, but pull any weeds immediately that do manage to breach the mulch.
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