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Thunbergia grandiflora
Also called Bengal clock vine, Blue sky vine, Blue trumpet vine, Clockvine, Bengal Clockvine, Blue Skyflower, Blue Thunbergia
Bengal trumpet is an evergreen flowering vine (species, not a genus) grown for its large blue trumpet-shaped flowers. It needs warmth, rich moist but well-drained soil, and room to climb or sprawl, and is often grown as an annual or overwintered indoors in cooler climates.
Thunbergia grandiflora is an evergreen vine in the family Acanthaceae. It is native to southeast Asia, particularly Indochina, and is widely naturalised elsewhere. Common names include Bengal clockvine, Bengal trumpet, blue skyflower, blue thunbergia, blue trumpetvine, clockvine, skyflower and skyvine. The specific epithet grandiflora means "large-flowered".
With a minimum temperature of 10–13 °C (50–55 °F), this plant is cultivated as a houseplant in temperate regions, and has gained the Royal Horticultural Society's Award of Garden Merit.
It is hardy in USDA hardiness zones 10 and 11, where it grows best in fertile, organically rich, moist but well-drained soils in full sun to partial shade. In hotter climates, it benefits from light afternoon shade. In cooler regions, it is commonly cultivated as an annual or overwintered indoors in containers. The species is propagated from seed, cuttings or overwintered container-grown plants. The species readily regenerates from its expansive tuberous root system. Shoots arising from the tubers are easily separated and transplanted, making vegetative propagation simpler and more reliable than growing plants from seed or stem cuttings. The species is generally free of serious insect pests and diseases, although it may be susceptible to scale insects, spider mites and whiteflies.
The plant is native to Assam, Bangladesh, Bhutan, Cambodia, South-Central China and Southeast China (Fujian Sheng, Guangdong Sheng, Guangxi Zhuangzu Zizhiqu, Hainan Sheng), East Himalaya, Laos, Peninsular Malaysia, Myanmar, Nepal, Northeast India, Thailand and Vietnam.
Blackeyed Susan vine · Bush clockvine · Golden Clockvine · Laurel clockvine · Mysore Trumpetvine · Blue Bell · Clockvines
Text excerpted from the Wikipedia article Thunbergia grandiflora by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
