Golden Trumpet, Common Allamanda
|This vigorous, fast-growing tropical vine is not low-maintenance, but responds to care with large, trumpetlike flowers. A native of mangrove swamps and lowland river banks, it is popular in subtropical gardens, where it clambers over fences, pillars and pergolas. Named for F. Allamand, an 18th-century Swiss doctor. Allamanda schottii's prickly fruits are used in floral arrangements, Allamanda cathartica is grown as a climber or small tree, and Allamanda blanchetti has rose-purple flowers. Flowers best in full sun and high heat and humidity, but needs shading from the strongest summer sun. Minimum temperatures of 55 to 60º F are ideal; it will not tolerate much frost, though mature plants can handle a few degrees lower. Move potted plants to a greenhouse in cold winters, but watch for whitefly and spider mites indoors. In early spring, cut back old stems and remove weak, straggling vines. Feed heavily during the growing season with a mix of leafmold and well-rotted, screened manure. Add coarse sand to the soil to improve drainage. Tie the vines for support as they grow, and pinch off new stem tips for a bushy shape. Keep plants nearly dry during their dormant season, from late autumn until early spring. Start new plants in late spring to early summer from cuttings in pots of leafmold and coarse sand.
This fast-climbing vine can be trained over a fence or arbor, or as a small tree.
Attributes - Allamanda cathartica
Plant Type: Vine
Bloom Season: Early Summer through Early Fall
Flower Color: Yellow
Height: 12 ft. to 18 ft.
Width: 18 ft.
Sunlight: Partial Sun
Climate: Zones 10, 11
Notes: Thrives in Acid Soil. Container Plants, Long Blooming, Showy Flowers. Susceptible to Spider Mites, Whiteflies.
Allamanda cathartica 'Hendersonii'