How to Grow Leucadendron
Leucadendron salignum
Leucadendron is a South African fynbos shrub prized for its dramatic coloured bracts in red, gold, and lime — and as a long-lasting cut flower. It demands specific conditions — acid, well-drained, nutrient-poor soil with absolutely no phosphorus fertiliser. In the UK it is tender and needs either a frost-free sheltered garden in the far south/west or container growing with winter protection. Prune by one third after flowering each year to keep it bushy and maximise bract colour.
Yearly Lifecycle
Care Essentials
Do NOT feed with general fertilisers containing phosphorus — this is fatal to Leucadendron. If feeding is needed, use a specialist protea/fynbos fertiliser very sparingly in spring only.
Watch For
- Root rot in poorly drained or alkaline soils
- Phytophthora in wet conditions
- Botrytis in humid cool weather
Care Requirements
Light
Full sun
Requires full sun all day. Will not flower well in shade. In the UK, a south-facing position is ideal.
Watering
Moderate, excellent drainage essential
Water moderately during the growing season. Excellent drainage is non-negotiable — waterlogged roots cause fatal root rot. In containers, never let the pot sit in water.
Pruning
One third after flowering
Cut back by about one third after flowering each year. Never cut into bare old wood. Regular pruning keeps the plant bushy and produces better bract colour.
Mulching
Light acid mulch only
A light mulch of pine bark or ericaceous compost is acceptable. Never use mushroom compost or lime-based mulches which raise soil pH.
