Dwarf Kowhai (Sophora prostrata Buchanan)

Dwarf Kowhai

Sophora prostrata Buchanan

Compact weeping branches bear sunny yellow trumpet blooms. Evergreen dwarf shrub; common name: Dwarf Kowhai.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; full sun promotes abundant flowering; tolerates coastal wind exposure
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Watering Allow top 2–3 cm of soil to dry between waterings; drought-tolerant once established
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Temperature Hardy to light frosts; avoid prolonged extreme heat above 28°C
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Characteristics

  • Leaf: Small, pinnate dark green leaflets arranged along slender, drooping stems
  • Flower: Bright yellow, pea-like tubular blooms clustered at branch tips
  • Stem: Slender, flexible weeping branches forming a dense, rounded canopy
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Care Guide

Watering

Keep soil evenly moist during active growth; avoid waterlogging

Fertilization

Apply balanced slow-release fertilizer once at growth onset. Use low-nitrogen fertilizer to promote flowering rather than foliage growth

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface and gently work into top layer to avoid root disturbance
Pruning
  • Prune immediately after flowering to maintain compact shape and encourage new growth
  • Remove dead, damaged, or overcrowded branches to improve airflow and light penetration
  • Trim back leggy stems in early spring to promote a dense, rounded canopy
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion leads to gastrointestinal upset, lethargy, and potential tremors in severe cases

Humans: Contains cytisine; ingestion causes nausea, vomiting, abdominal pain, and dizziness in large doses

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Garden Uses & Culture

Culture: Associated with New Zealand's native coastal ecosystems; valued for ornamental landscaping

Usage: Ornamental garden shrub; suitable for rock gardens, container planting, and coastal hedges