in ,

How to Grow Allamanda

Sharing is caring!

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.

Written by Stephen Albert

Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen Garden Grower’s Guide. His Vegetable Garden Grower’s Masterclass is available online. has more than 10 million visitors each year.

How To Grow Tips

How To Grow Tomatoes

How To Grow Peppers

How To Grow Broccoli

How To Grow Carrots

How To Grow Beans

How To Grow Corn

How To Grow Peas

How To Grow Lettuce

How To Grow Cucumbers

How To Grow Zucchini and Summer Squash

How To Grow Onions

How To Grow Potatoes

How to Grow Magic Flower — Achimenes

How to Grow Capsicum – Pepper