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How to Grow Allamanda

Golden trumpet, Allamanda cathartica
Golden trumpet, Allamanda cathartica

Allamanda is a tropical vining plant cultivated for its large, fragrant, funnel-shaped yellow or purple flowers. Allamanda is covered with large blossoms for much of the year.

Allamanda’s bright color, fast growth, and low maintenance make it a popular vine. It tolerates hot, sunny locations. It is a good choice for covering walls, fences, arbors, or as a freestanding shrub.

Where winters dip to freezing temperatures, Allamanda is an excellent choice for containers where it can be brought indoors in winter or grown as an annual.

Allamanda is a genus of 12 species of evergreen shrubs and scandent climbers native to tropical North, Central and South America.

Get to Know Allamanda

  • Plant type: Tropical evergreen shrubs and climbers
  • Growing zones and range: Zones 11-15
  • Hardiness: Tender; grow in a greenhouse or indoors where temperatures tall to 45°F (7°C)
  • Height and width: 6 to 25 feet (2-8m) tall and wide
  • Foliage: Simple leaves
  • Flowers: Showy, terminal cymes of large funnel or trumpet-shaped fragrant yellow or purple flowers
  • Bloom time: Spring and summer
  • Uses: In tropical regions grow on a wall or border; houseplant in temperate regions
  • Common name: Golden trumpet
  • Botanical name: Allamanda
  • Family name: Apocynaceae
  • Origin: Tropical North, Central, and South America
Golden trumpet, Allamanda cathartica
Golden trumpet, Allamanda cathartica

Where to Plant Allamanda

  • Light outdoors: Grow Allamanda in full sun outdoors.
  • Soil outdoors: Grow Allamanda in moist, humus-rich soil outdoors.

When to Plant Allamanda

  • Set containerg-grown Allamanda outdoors any time of the year in subtropical and tropical regions.

Planting and Spacing Allamanda

  • Space Allamanda 6 feet (2m) or more apart.

How to Water and Feed Allamanda

  • Water Allamanda freely during the growing season. Water sparingly in winter.
  • Feed Allamanda with a balanced liquid fertilizer every 2 to 3 weeks.

Allamanda Care

  • Cut back palnts in early spring before new growth starts.
  • Large plants can be trained to cover a wall; smaller plants can be given a small trellis or support on whciht to grow.
  • Contact with sap may irritate the skin; all parts may cause mild stomach upset if ingested.

Growing Allamanda as a Houseplant

  • Grow Allamanda in a warm room with direct light and high humidity,
  • Allow the growing medium to become dry between waterings in fall and winter; keep the medium evenly moist during spring and summer.
  • Feed Allamanda every two wek swhen the plants are in growth or in flower.

Allamanda Pests and Diseases

  • Allamanda can be damaged by spider mites, mealybugs, scale insects, and whiteflies.
  • Allamanda can be attacked by fungal leaf spot.
Golden trumpet, Allamanda cathartica
Golden trumpet, Allamanda cathartica

Allamanda Propagation

  • Propagate Allamanda by seed in spring.
  • Root greenwood cuttings in late spring or early summer.

Allamanda Varieties to Grow

  • Allamanda blanchetii. Erect shrub with oblong leaves; produces cymes of tumpets-shaped purplish-pink flowers in summer.
  • A. cathartica, golden trumpet. Grows 2 to 6 feet tall or more; whorled, waxy, dark green leaves; 5-inch bright green flowers. Cultivars include “Hendersonii’ has leathery leaves and large flowr, buds tinged in brown; ‘Nobilis’ bright, clear yellow flowers with swet fragrance; ‘Schottii’ flowers have dark stripe on throat; ‘Stansill’s Double’ double-flowered; ‘Williansii’ has yellowish flwoers with reddish brown throats.

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