How to grow juniper grevillea
Overview
Grevillea juniperina is a dense, prickly shrub from eastern Australia, valued for its fine-textured foliage and reliable seasonal flowers. It provides structure and habitat in native gardens, and its needle-like leaves create a visual link between bolder feature plants.
Varieties
- Grevillea juniperina 'Molonglo' — Compact, 1 m tall with red flowers; ideal for small gardens.
- Grevillea juniperina 'Pink Pimpernel' — Prostrate form, 0.3 m high, pink flowers; good groundcover.
- Grevillea juniperina 'Sundancer' — Dwarf, 0.5 m, yellow-orange flowers; suits pots and rockeries.
Soil Preparation
Prefers free-draining, slightly acidic to neutral soil (pH 5.5–7.0). Add coarse sand or gravel to heavy clay. Avoid rich compost or manure; use a native potting mix if in containers. A handful of gypsum helps break up clay before planting.
Growing Guide
Plant in full sun in well-drained, sandy or loamy soil. Space 1–2 m apart for a dense screen. Dig a hole twice the pot width, backfill with native mix, and water in. Mulch with gravel or coarse bark to keep roots cool. Avoid heavy clay or wet feet; if soil is poor, mound the bed 15–20 cm high.
Care
Feed in early spring with a low-phosphorus native fertiliser (e.g., 8N–1P–5K). Prune lightly after flowering to maintain shape and encourage dense growth. Remove dead wood as needed; no heavy pruning required.
Companion Planting
Pairs well with other Grevilleas, Banksias, and Hakeas for a mixed bird-attracting hedge. Underplant with low-growing Westringia or Lomandra. Avoid planting near moisture-loving vegetables or lawns that need frequent watering.
Common Pests & Risks
Scale insects and leaf miners can appear in humid weather. Check for sticky honeydew or distorted leaves. Control scale with horticultural oil in early spring; treat leaf miners by removing affected foliage and encouraging natural predators like parasitic wasps.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce water and check roots. Brown leaf tips: dry soil or salt burn; water deeply and flush soil. Sparse growth: too much shade or nitrogen; move to sun and use low-P feed. No flowers: overfeeding or wrong pruning; cut back after flowering only. Dieback: fungal root rot in wet soil; improve drainage or replant in raised bed.