Thunbergia grandiflora, also known as sky flower or clock vine, is a flowering vine with tube-shaped, bluish-purple blooms. Thunbergia grandiflora is perennial in U.S. Department of Agriculture plant hardiness zones 8 to 11 and can be propagated by layering or cuttings.
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Thunbergia grandiflora can be propagated by stem cuttings any time between spring and fall. A 4- to 6-inch vine tip is cut from the plant and planted in a container filled with potting soil. After a few weeks in moderate sunlight, the rooted vine can be planted outdoors.
Layering is an effective way to propagate Thunbergia grandiflora. In layering, a low-growing branch is bent to the ground. The bark is scraped where the branch touches the ground, then the scraped area is pinned to the ground with bent wires. The branch develops roots from the wounded bark, and is severed from the parent plant.
Thunbergia grandiflora should be planted where the vine will receive morning sunlight and afternoon shade. The vine will need a sturdy fence or trellis on which to climb. The soil is kept consistently moist.
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