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Culture
Winter hardy to USDA Zones 10-11 where it is best grown in organically rich
fertile, medium moisture well-drained soils in full sun to part shade.
Appreciates some light afternoon shade in hot summer climates. In St. Louis,
it is best grown as an annual vine. New plants may be purchased in spring each year.
In the alternative, plants may be grown from seed started indoors 6-8 weeks
before last spring frost date. Container plants may be overwintered indoors in a warm sun room and
or cuttings may be taken in late summer for overwintering.

Noteworthy Characteristics
Blue trumpet vine (also clock vine, sky vine and sky flower) is a woody-stemmed
evergreen, tropical, twining climber. It grows to 15-30’ long in frost free areas.
When grown as an annual, it grows to 6-8’ long in a single season. It is native to India.
Elliptic to heart-shaped dark green leaves (to 4-8” long) are covered with soft hairs.
Trumpet shaped flowers (to 3”) are lavender blue with yellow throats.
Flowers appear singly or in clusters (racemes) in summer to early fall.
Flowers bloom year round in tropical climates. Genus name honors Carl Peter Thunberg (1743-1829),
Swedish botanist, naturalist and plant collector.

Problems
No serious insect or disease problems. Watch for scale, spider mites and whiteflies.

Garden Uses
Trellises, arbors, fences or other structures in areas where winter hardy.
Hanging baskets and other containers when grown as an annual. Houseplant.