New Zealand Holly (Olearia macrodonta) - How to Grow & Care Guide

Plant Snapshot

Common Name: New Zealand Holly
Latin Name: Olearia macrodonta
Hardiness Zones: USDA zones 8–10. In colder zones expect winter dieback and slow recovery. In warmer zones growth is more vigorous and evergreen habit is retained.
Typical Height: 8–20 ft (2.5–6 m) tall typically, occasionally taller in sheltered sites.
Typical Spread: 6–15 ft (1.8–4.5 m) spread common, forming a broad shrub or small tree crown.
Bloom Period: Spring to early summer with clusters of white daisy-like flowers.
Soil Preferences: Prefers well-drained, fertile to moderately poor soils. Tolerates slightly acidic to neutral pH. Waterlogged heavy clay is problematic and can cause root loss.
Light Preferences: Full sun to partial shade. Best flowering and leaf tone in sun. In hot inland climates some afternoon shade can reduce stress.
Toxicity: No widely reported severe toxicity to people or pets. May cause skin irritation in sensitive individuals due to being in the Asteraceae family. Verify with local poison control for safety around children and animals.
Propagation: Raised from seed and by semi-ripe cuttings taken in the growing season. Layering and careful pruning to promote new shoots are also used.

Key Facts

Evergreen shrub or small tree native to New Zealand.
Leaves are toothed and holly-like in shape with a greyish underside.
Clusters of white daisy-like flowers appear in spring to early summer.
Valued for screens, hedging and coastal planting.
Prefers well-drained soils and dislikes waterlogging.
Tolerates some frost but can suffer dieback in cold inland sites.
Propagated by seed and semi-ripe cuttings.

New Zealand Holly is an evergreen shrub or small tree valued for bold, toothed leaves and clusters of white daisy like flowers in spring to early summer. Its maritime tolerance and broad habit make it useful as a screen or specimen where soils drain freely.

Identification

Olearia macrodonta has holly like toothed leaves with a greyish underside and forms a broad evergreen shrub or small tree. It typically reaches about 2.5 to 6 metres tall and commonly spreads 1.8 to 4.5 metres, with heads of white daisy like flowers appearing in spring to early summer.

Best uses and where to grow

This species is prized for coastal planting, screening and hedging in milder sites where winter wet is limited. It suits sheltered sunny to partly shaded positions and performs well in maritime exposure. Approximate hardiness is USDA zones 8 to 10, so choose a protected site in cooler inland areas to reduce winter damage.

Planting and spacing

Plant New Zealand Holly in a sunny or partially shaded, well drained position. For a screen or hedge space plants about 1.8 to 4.5 metres apart to allow the broad crown to develop. Firm soil around roots at planting and water in well to settle the rootball, then monitor moisture until the shrub establishes.

Soil and watering

Prefers well drained soils ranging from fertile to moderately poor and tolerates slightly acidic to neutral pH. Avoid heavy waterlogged clay which can cause root loss and decline. After establishment reduce supplementary watering; keep newly planted specimens regularly moist but never sitting in water.

Sunlight and frost tolerance

Best flowering and leaf tone occur in full sun while some afternoon shade can ease stress in hot inland sites. The plant tolerates some frost but can suffer dieback in cold inland locations, so give a sheltered position or winter protection where severe freezes occur.

After flowering care and pruning

Light pruning after flowering maintains shape for hedging and encourages bushy new shoots. Prune to a framework rather than cutting hard into old wood to avoid bare patches. In colder areas remove winter damaged shoots in spring to encourage fresh growth and reduce long term dieback.

Propagation

Raised from seed and by semi ripe cuttings taken during the growing season. Cuttings root best from semi ripe wood and benefit from bottom heat in cooler climates. Layering and careful pruning to promote new shoots are alternative methods for multiplying specimens.

Frequently asked questions

How fast does New Zealand Holly grow?: Growth is moderate and site dependent. Plants commonly reach about 2.5 to 6 metres over several years, with rate influenced by soil, light and pruning.
Is New Zealand Holly suitable for coastal gardens?: Yes. The species tolerates maritime exposure and is commonly used in coastal planting where soils drain well.
Can it be used as a hedge or screen?: Yes. Its broad habit and evergreen foliage make it effective for screens and hedging when spaced and pruned appropriately.
How should I propagate New Zealand Holly?: Use seed or semi ripe cuttings taken in the growing season. Cuttings often root better with bottom heat; layering and pruning to encourage new shoots also work.
Is it hardy in cold climates?: Approximate hardiness is USDA zones 8 to 10. It tolerates some frost but can suffer dieback in colder inland sites, so provide shelter in cooler areas.