Kowhai
Sophora microphylla · Fabaceae
📷 Grapeman4 · CC BY-SA 3.0
⚠️ Graines et alcaloïdes : chiens, chats et enfants risquent toxicité gastro-intestinale grave par ingestion.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around kowhai and prepare for winter.
ID card
- Foliage
- Deciduous to semi-evergreen depending on climate
- Flowering
- Spring (March to May), golden yellow flowers
- Mature size
- 3.5 to 4 m tall, spreading shrubby form
- Growth rate
- Moderate to fast
- Hardiness
- Tender (avoid intense frosts, hardy to -5 °C)
- Origin
- New Zealand
- Soil type
- Well-drained, light, tolerates limestone
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Sophora microphylla is easy to grow once established. Water well for the first two years to develop a strong root system.
The common mistake
Planting in partial shade or insufficient light: the plant grows slowly, gradually yellows, and flowers very little or not at all.
The pro's trick
In February, apply mature compost on the surface without burying it to support spring growth.
Care
Watering
Water regularly during the growing season, especially in dry periods. Reduce watering in winter. Aim for soil that dries slightly between waterings: Sophora hates excess moisture and waterlogged roots.
Light exposure
Plant your Sophora in full sun for optimal flowering and a compact shape. It tolerates light shade, but flower production decreases. Choose a well-ventilated spot, sheltered from strong winds and late frosts.
Soil and drainage
Enrich the soil with compost or potting mix at planting time. Ensure excellent drainage, especially in humid regions. This shrub thrives in light, even chalky soil, and refuses heavy, suffocating substrates.
Pruning and shaping
Prune lightly after flowering (May-June) to maintain a balanced shape and encourage branching. Remove dead or poorly placed branches. Avoid severe pruning, which weakens the plant.
Fertilizing
Apply balanced fertilizer in spring when growth starts. One annual application is usually sufficient. A layer of compost on the surface helps feed the soil gradually and retain moisture.
Pests and diseases
Generally hardy, Sophora can be affected by powdery mildew in overly humid, stagnant conditions. Ensure good air circulation and avoid foliage watering. Check regularly for spider mites or aphids if the plant is water-stressed.
Did you know?
The small-leaved Sophora is a sacred tree in New Zealand, venerated by the Māori as 'kōwhai.' Its brilliant golden flowers are among the first signs of austral spring and symbolize hope and renewal in Polynesian culture.
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.
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Tips generated and checked by Viridia — adapt them to your local climate.