How to Care for Grevillea Plants

Grevilleas are hardy and bird-attracting, but they still need the right conditions to thrive. Good soil, plenty of sun, and the correct fertiliser make all the difference.

Soil

Free-draining sandy or loamy soils are best—Grevilleas dislike heavy clay.
Soil pH: slightly acidic to neutral (pH 5.5–7.0).
Always use a native-safe, low-phosphorus potting mix when growing in containers.

Sunlight

Grevilleas thrive in full sun with at least 6 hours of direct light per day.
They can tolerate light shade, but flowering will be reduced.

Watering

Deeply water young plants 1–2 times per week until established.
Once established, Grevilleas are drought-tolerant but still benefit from occasional deep watering in hot weather.
Avoid constant wet soil—good drainage is critical to prevent root rot.

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Fertiliser for Grevillea Care

Feeding Grevilleas correctly keeps them flowering and prevents common issues like yellow leaves or poor growth. They are very sensitive to phosphorus, so only use low-phosphorus fertilisers with under 3% P.

Seasonal Fertiliser Plan

Spring: Apply CompleteGrow NPK 20-20-20 at a diluted rate to fuel leafy growth and set flower buds.
Summer: Switch to CompleteGrow 4-18-38 + CaMg, rich in potassium, to extend flowering and boost nectar for birds.
Autumn: Light feeding every 4–6 weeks helps maintain colour and strengthen roots.
Winter: Minimal fertiliser. Apply only a light liquid feed to avoid weak, frost-prone growth.

Application Tips

Always water before fertilising to prevent root burn.
Spread fertiliser around the drip line, not directly on the crown.
For potted Grevilleas, fertilise every 2–3 weeks with diluted liquid feed, since nutrients wash out quickly.

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Pruning, Mulching & Ongoing Care

Pruning

Prune lightly after each flowering flush to encourage new blooms.
Avoid cutting into old, bare wood—Grevilleas may not regrow from it.
Regular pruning keeps plants compact and extends their lifespan.

Mulching

Apply a 5–7cm layer of mulch to conserve moisture and suppress weeds.
Keep mulch away from the crown to prevent rot.
Use organic mulch like bark, sugarcane, or gravel for natives.

Care Checklist

Plant in free-draining soil and full sun.
Water deeply, especially in hot spells, but avoid soggy soil.
Feed with CompleteGrow fertilisers every 4–6 weeks in the growing season.
Prune regularly to maintain flowers and shape.
Mulch to protect roots and conserve water.

Final Recommendation: With the right care—sunlight, pruning, and especially the right fertiliser—Grevilleas reward gardeners with year-round flowers, lush foliage, and healthy growth. CompleteGrow low-phosphorus fertilisers keep them safe, strong, and thriving for years.