How to Grow King Protea
Protea cynaroides
King Protea is South Africa's national flower, prized for its enormous artichoke-shaped flower heads with pink-white bracts. Plant in full sun with excellent drainage in acidic, low-phosphorus soil. Never use phosphorus-rich fertilisers, and never overwater. Allow soil to dry between waterings. Prune after flowering by cutting stems back to healthy foliage. In cold or wet climates, grow in large containers with a free-draining mix and move under cover for winter. Slow to establish but can live for decades in the right spot. The key to success is drainage, drainage, drainage.
Yearly Lifecycle
Care Essentials
Avoid phosphorus-rich fertilisers which are toxic to Proteaceae. Use a low-phosphorus native plant feed sparingly in spring, or no feed at all. These plants evolved in nutrient-poor soils.
Watch For
- Phytophthora root rot (main killer in wet soil)
- Leaf spot fungus
- Protea beetle
Companions
Leucospermum, Erica, Restio, Leucadendron
Care Requirements
Light
Full sun essential
Requires full sun for healthy growth and flowering. At least 6 hours of direct sunlight daily. Poor light produces weak leggy growth and no flowers.
Watering
Deep but infrequent, let soil dry
Water deeply every 10-14 days during active growth. Allow soil to dry completely between waterings. Reduce in winter. Never leave the root zone waterlogged.
Fertilizing
No phosphorus, minimal feeding
Avoid phosphorus-rich fertilisers which are toxic to Proteaceae. Use a low-phosphorus native plant feed sparingly in spring, or no feed at all. Evolved in nutrient-poor soils.
Pruning
Cut back after flowering
Harvest or deadhead flower stems by cutting 10 cm above the nearest branching point with healthy leaves. Never hard-prune into old leafless wood.
