How to Grow Pohutukawa
Metrosideros excelsa
Pohutukawa is a striking coastal tree producing masses of crimson flowers in early summer. Plant in full sun in well-drained soil; it thrives near the sea and tolerates salt spray. Water regularly for the first 2-3 seasons until established — after that it is highly drought-tolerant. Frost-sensitive when young; choose a sheltered spot in cooler zones. Mulch the root zone to conserve moisture and protect roots. Minimal pruning needed — shape lightly when young, then leave it to mature.
Yearly Lifecycle
Care Essentials
Mulch with compost in spring. Established trees are self-sufficient and rarely need additional feeding.
Watch For
- Scale insects
- Root rot in waterlogged soil
- Frost damage on young growth
Care Requirements
Light
Full sun; coastal or sheltered inland site
Requires full sun for the best flowering display. Thrives near the coast and tolerates salt-laden winds. In cooler climates, choose a south-facing, sheltered position.
Spacing
8-10m; allow for large mature spread
Pohutukawa can spread very wide at maturity — allow at least 8-10m from buildings and other trees. It can also be grown as a large container specimen when young.
Watering
Regular when young; drought-tolerant once established
Water weekly for the first 2-3 years to help establish deep roots. Once mature, pohutukawa is highly drought-tolerant and rarely needs supplemental watering except during prolonged dry spells.
Fertilizing
Compost mulch in spring; feeding rarely needed
Mulch with compost in early spring. Established trees growing in reasonable soil rarely need additional fertiliser. Avoid high-nitrogen feeds which promote soft, frost-susceptible growth.
Pruning
Light shaping when young; minimal once mature
Prune lightly in the first few years to build a good structure. Mature trees need very little pruning — remove dead or crossing branches in late spring after any frost risk has passed.
Mulching
5-8cm mulch ring annually; keep away from trunk
Apply a generous mulch ring of organic material each spring. This conserves moisture, keeps roots cool, and provides some frost protection. Keep mulch a few centimetres from the trunk to avoid bark rot.
Growing Tips
Plant in a coastal or sheltered site
Pohutukawa thrives in coastal conditions and tolerates salt spray. In colder inland zones, choose a warm, sheltered, south-facing wall.
Water well when young
Water regularly for the first 2-3 years to help the tree establish. Once mature it is highly drought-tolerant and needs little supplemental watering.
Mulch to protect roots
Apply 5-8 cm of organic mulch over the root zone annually, keeping it a few centimetres from the trunk. This conserves moisture and protects against any ground frost.
Protect young plants from frost
Young trees are frost-sensitive. Fleece or move container plants under cover if temperatures below 0°C are forecast until the tree is well established.
Pests & Diseases
Pest Scale Insects
Identification: Brown or white waxy bumps on stems and branches; sticky honeydew on leaves; sooty mould below
- Scrub off scale with a soft brush and soapy water
- Apply horticultural oil spray in late spring
- Use a systemic insecticide if infestation is severe
Disease Root Rot
Symptoms: Yellowing leaves, wilting, dieback; roots appear brown and mushy
Treatment: Improve drainage immediately; remove affected roots if possible; avoid overwatering
Prevention: Plant in well-drained soil; never allow roots to sit in waterlogged conditions
