Clock vines belong to the genus thunbergia along with the black-eyed Susan. It is a fast growing vine that attracts hummingbirds. Clock vines are native to tropical Africa, South Africa, Asia and India.
Clock vines, which produce yellow, orange or white flowers and dark green leaves, can grow to a height of 5 to 6 feet, provided they get proper support. The plant will bloom more in the early fall than it will during the hot days of summer.
They prefer full sun, but plant them where they can get some shade in the afternoon. It is a hardy perennial in zones 9 to 11; in other areas it will be an annual.
Clock vines need a moist, well-drained soil mixed with compost. Plant about 3 feet apart if it is to grow up and 4 feet apart if it is to be allowed to spread. Lightly fertilize every 6 to 8 weeks.
Spider mites, white flies and scale insects can cause the leaves to become discolored and fall off and can damage the flowers. Inspect the plant regularly and remove any damaged parts.
Clock vines are used in hanging baskets, in containers with other flowers, climbing up a trellis or arbor, or along a fence. Left alone and unsupported, it can be used as a ground cover.
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