How to grow japanese box
Overview
Japanese box (Buxus microphylla) is a dense, fine-textured evergreen shrub grown for low hedges, borders, and topiary. It provides structure and year-round green in formal and informal gardens. It is slower growing than English box and more resistant to heat and humidity.
Varieties
- Buxus microphylla 'Faulkner' — Compact, dark green leaves; popular for low hedges in Australian gardens.
- Buxus microphylla 'Green Gem' — Dwarf form, very slow growing; ideal for small topiary and pots.
Soil Preparation
Prefers slightly acidic to neutral soil (pH 6.0–7.0). Enrich with well-rotted compost or manure before planting. Improve drainage in clay soils by adding gypsum and raising beds.
Growing Guide
Plant in well-drained soil enriched with organic matter, in a position with morning sun and afternoon shade. Space 30–40 cm apart for a dense hedge. Dig the hole twice as wide as the root ball and backfill with compost. Water deeply after planting and mulch to keep roots cool. Avoid planting in heavy clay or waterlogged spots.
Care
Feed with a balanced slow-release fertiliser (e.g. Osmocote) in early spring and again in late summer. Prune lightly with shears every 6–8 weeks during active growth to maintain shape. Remove no more than one-third of new growth per trim.
Companion Planting
Pairs well with lavender, rosemary, and hebe for contrasting texture. Avoid planting near large trees with competitive roots. Good alongside roses and camellias in mixed borders.
Common Pests & Risks
Box blight (Cylindrocladium) causes leaf drop and stem lesions; prune out infected growth and apply copper fungicide. Box mites cause stippled leaves; control with horticultural oil in spring. Scale insects can be wiped off or treated with neem oil.
Troubleshooting
Yellow leaves: often from poor drainage or overwatering; improve soil and reduce watering. Brown leaf edges: caused by salt burn or dry winds; flush soil with water and shelter from wind. Sparse growth: too much shade; move to brighter spot. Leaf drop: box blight; prune and treat with fungicide. Stunted growth: root competition from nearby trees; plant in raised bed.