How to Grow Waratah
Telopea speciosissima
Waratahs thrive in acidic, well-drained sandy or loamy soil in partial shade to full sun. They are sensitive to phosphorus, so always use low-phosphorus native plant fertilisers. Water regularly but never let roots sit in wet soil. Prune hard immediately after flowering by cutting stems back to half their length; the lignotuber ensures vigorous regrowth. Protect from heavy frost when young. Spectacular red flower heads appear in spring on established plants after about five years from seed.
Yearly Lifecycle
Care Essentials
After flowering with a slow-release, low-phosphorus native plant fertiliser. Avoid high-phosphorus feeds which can be fatal.
Watch For
- Root rot from poor drainage
- Scale insects
- Borers
- Phytophthora dieback
Companions
Grevillea, Banksia, Correa, Tree ferns
Care Requirements
Light
Partial shade to full sun
Prefers partial shade, especially afternoon shade in hot climates. Will not thrive in deep shade or scorching full sun. Morning sun with dappled afternoon light is ideal.
Watering
Regular watering; never waterlogged
Water regularly to keep roots moist but never sitting in wet soil. Excellent drainage is essential. Established plants tolerate short dry spells but prolonged drought reduces flowering.
Fertilizing
Low-phosphorus native fertiliser after flowering
Feed once a year after flowering with a slow-release, low-phosphorus fertiliser formulated for native plants. High phosphorus is toxic to Proteaceae family plants including Waratah.
Pruning
Hard prune immediately after flowering
Cut stems back to half or two-thirds immediately after flowering finishes. The lignotuber stores energy and produces vigorous new shoots. This promotes more flower heads the following season.
Growing Tips
Drainage is everything
Waratahs die in waterlogged soil. If your soil is heavy clay, plant on a mound or in a raised bed with coarse sand mixed in.
Never use high-phosphorus fertiliser
As a member of the Proteaceae family, Waratah roots are highly efficient at absorbing phosphorus and excess is toxic. Always use native plant fertiliser.
Prune hard after flowering
Do not be timid with pruning. The lignotuber stores energy to fuel regrowth. Hard pruning promotes bushier growth and more flower heads the following spring.
