How to Grow Hardenbergia

Hardenbergia violacea
Hardenbergia violacea

Hardenbergia is a shrubby vine with climbing branches that bears showy clusters of usually purple to lilac colored, pea-shaped flowers in early spring.

Hardenbergia vines can grow 8 to 10 feet tall. They will easily cover a small trellis or fence. Where not supported, Hardenbergia can be grown as a groundcover and allowed to cascade o er banks and slopes.

Hardenbergia grows best in slightly acid, well-drained soil. Hardenbergia can be damaged by light to moderate frosts.

Hardenbergia is a genus of 3 species native to Australia.

Get to Know Hardenbergia

  • Plant type: Evergreen vine
  • Growing zones and range: Zones 10-15
  • Hardiness: Deciduous in Zone 9
  • Height and width: 6 feet (2m) tall or more
  • Foliage: Alternate lance-shaped, deep-green, leathery leaves which can be palmate
  • Flowers: Small, pea-like flowers borne in racemes
  • Flower color: Pink to purple, sometimes wi=hite
  • Bloom time: Spring
  • Uses: Cover arbor, pergola, or wall
  • Common name: Coral pea
  • Botanical name: Hardenbergia
  • Family name: Fabaceae
  • Origin: Australia
Purple Coral Pea, Hardenbergia violacea, blooming in spring
Purple Coral Pea, Hardenbergia violacea, blooming in spring

Where to Plant Hardenbergia

  • Grow Hardenbergia in full sun to partial shade
  • Grow Hardenbergia in moderately fertile, moist, but well-drained soil. Slightly acidic soil is best.
  • Where not hardy, Hardenbergia can be grown in a temperate greenhouse.

When to Plant Hardenbergia

  • Plant container-grown Hardenbergia in the garden in spring.

Planting and Spacing Hardenbergia

  • Space

How to Water and Feed Hardenbergia

  • Water Hardenbergia moderately during th growing season.
  • Fertilize Hardenbergia with a balanced liquid fertilizer monthly.

Hardenbergia Care

  • Provide support for Hardenbergia to climb.
  • Without support Hardenbergia can be grown as a groundcover.

Hardenbergia Pests and Diseases

  • Hardenbergia is sometimes affected by bacterial an fungal leaf spots.
  • Hardenbergia can be attacked by spider mites and aphids.

Hardenbergia Propagation

  • Sow Hardenbergia seeds at 68°F (20°C) in spring; presoak seeds for a day to aid germination.
  • Root softwood cuttings in sring.

Hardenbergia Varieties to Grow

  • Hardenbergia comptoniana. Vigorous climber; grows to 10 feet tall or more; bears penden, mauve to purple flowers; best in moist, slightly acid soil.
  • H. violacea, purple coral pea. Climber or sometimes trailing; purple to violet flowers borne on racemes; grows to 6 feet tall; well-adapted to dry climates; cultivars include ‘Alba’ with white flowers, ‘Happy Wanderer’ with purple-blue flowers.


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