How to grow pittosporum
Overview
Pittosporum tenuifolium is an evergreen shrub from New Zealand, grown for its dense, often variegated foliage and fast growth. It is widely used for hedging, screening, or as a structural garden element. Success depends on regular clipping to maintain form and density.
Varieties
- Silver Sheen — Fast-growing with shimmering silver-green leaves; excellent for hedging.
- James Stirling — Dwarf form with lime-green foliage; ideal for low borders or pots.
- Golf Ball — Compact, naturally rounded habit; minimal pruning needed.
- Golden King — Yellow-edged variegated leaves; adds colour to screens.
- Tasman Ruffles — Wavy-edged dark green leaves; distinctive texture.
Soil Preparation
Prefers well-drained loamy soil with pH 5.5–6.5. Enrich with compost or well-rotted manure before planting. Heavy clay requires raising beds or adding gypsum to improve drainage.
Growing Guide
Plant in well-drained soil in full sun to part shade. Space 60–100 cm apart for hedges. Water deeply until established, then reduce to moderate. Apply a layer of organic mulch to retain moisture and suppress weeds. Avoid waterlogged sites. Best planted in autumn or spring when temperatures are mild.
Care
Feed in early spring with a balanced slow-release fertiliser. For a dense hedge, clip 2–3 times during the growing season. Remove any dead or damaged branches after pruning sessions. Light pruning after flowering keeps shape tidy.
Companion Planting
Pairs well with other hedge plants like Photinia and Viburnum, or as a backdrop for flowering perennials such as Lavender and Penstemon. Avoid planting too close to trees with aggressive root systems that compete for moisture.
Common Pests & Risks
Scale insects cause sooty mould; treat with horticultural oil. Aphids can be controlled with insecticidal soap or by encouraging beneficial insects. Leaf spot diseases occur in humid conditions – improve air circulation and avoid overhead watering.
Troubleshooting
Yellow leaves: overwatering or poor drainage – reduce watering and improve soil. Leaf drop: frost damage or prolonged drought – protect from hard frosts, water during dry spells. Sooty mould: scale infestation – treat scales, wipe off mould. Leggy growth: insufficient light or lack of pruning – move to sunnier spot or increase clipping frequency. Brown leaf edges: windburn or salt spray – shelter from strong winds, avoid coastal planting without protection.