Indigofera heterantha
Indigofera heterantha · Fabaceae
📷 Sten Porse · CC BY-SA 3.0
The gardener's calendar
Indigofera heterantha is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Scientific name
- Indigofera heterantha
- Family
- Fabaceae (legumes)
- Type
- Deciduous shrub
- Adult height
- 1.5 m
- Flowering
- June to September
- Foliage
- Deciduous, compound, finely serrated
- Hardiness
- Zone 6 to 8 (-10 to -5°C)
- Origin
- Himalayas (India, Pakistan)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Indigofera heterantha flowers for a long time (June-September) if you prune it moderately in February-March, cutting the canes by half. This encourages dense branching and a profusion of small pink-lilac flowers.
The common mistake
Not pruning at all or pruning too late (May): the shrub grows leggy, stays bare at the base, sparse flowering only at the top.
The pro's trick
A light application of flowering plant fertilizer (rich in mature compost) in May-June intensifies flower color and extends blooming until the first frosts.
Care
Sunlight
Heteranthus indigo demands full sun to thrive and flower abundantly. Plant it in a location receiving at least 6 to 8 hours of direct sunlight daily. In shade, flowering will be less generous and growth weaker.
Watering
Keep the soil regularly moist during growth and flowering (spring-summer), but without waterlogging. In winter, reduce watering since the shrub enters dormancy. Water at the base to avoid wetting the foliage.
Soil
Prefer well-drained, fertile soil rich in organic matter. Since indigo tolerates slightly acidic to neutral soils, add decomposed compost when planting. Avoid heavy, chalky soils or those that stay constantly wet.
Fertilizing
Enrich the soil in spring with compost or balanced fertilizer. Being a legume, this shrub partially fixes atmospheric nitrogen; moderate feeding is sufficient. Optionally, apply fertilizer again in early summer to support flowering.
Pruning
Prune lightly after flowering (September-October) to maintain compact shape and thin out the canopy. In late winter, remove dead or weak wood. This shrub handles pruning well and regrows vigorously in spring.
Diseases and pests
Indigo is generally robust. Watch for scale insects on greenhouse or potted plants. Powdery mildew can appear in warm, humid weather; improve air circulation. No major problems in outdoor conditions in suitable climates.
Did you know?
Indigofera heterantha, like its cousins, long supplied natural indigo, the precious blue dye sought by dyers worldwide. Though less famous than common indigo (I. tinctoria), this Himalayan species seduces gardeners with its profusion of pink-mauve flowers and airy foliage. Industrial synthetic indigo production in the twentieth century relegated these plants to ornamental gardens, where they shine as discreet jewels.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- Chinese wisteriaWisteria sinensis
- Common broomCytisus scoparius
- Black locustRobinia pseudoacacia
- Common PeaLathyrus oleraceus
- Honey locustGleditsia triacanthos
- Hairy greenweedGenista pilosa
Tips generated and checked by Viridia — adapt them to your local climate.