How to grow bottlebrush hedge
Overview
Bottlebrush hedge (Melaleuca citrina) is a dense, evergreen shrub grown for its vibrant red or yellow bottlebrush flowers and fine-textured foliage. It is a versatile hedging plant that provides structure, privacy, and reliable seasonal interest in the garden.
Varieties
- Melaleuca citrina 'Red Cluster' — Compact form with dense red flowers, ideal for tight hedges.
- Melaleuca citrina 'Yellow' — Vibrant yellow flowers, good for colour contrast in the garden.
Soil Preparation
Bottlebrush hedge prefers well-drained, slightly acidic to neutral soil (pH 5.5–7.0). Amend heavy clay with organic matter or sand to improve drainage. Avoid waterlogged sites; raised beds or mounds help in wet areas.
Growing Guide
Plant bottlebrush hedge in full sun for best flowering and dense growth. Space plants 60–80 cm apart for a solid hedge. Prepare a well-drained soil and water deeply after planting, then reduce to moderate once established. Prune after each bloom cycle to maintain shape and encourage branching. Avoid heavy pruning in late autumn to prevent frost damage to new growth.
Sowing
Bottlebrush is commonly grown from seed, but cuttings are more reliable for true-to-type plants. Sow seeds in spring or early summer in a seed-raising mix, covering lightly. Germination takes 2–4 weeks at 20–25°C. Transplant seedlings when 10–15 cm tall.
Care
Feed with a slow-release native fertiliser in early spring and again after flowering to support growth. Prune lightly after each bloom cycle to maintain shape and encourage dense growth. Remove spent flowers to promote reblooming and prevent seed formation.
Companion Planting
Bottlebrush hedge pairs well with other Australian natives like Grevillea, Callistemon, and Westringia, which share similar sun and water needs. It also attracts birds and beneficial insects, making it a good companion for flowering perennials. Avoid planting near water-loving plants that require constant moisture, as bottlebrush prefers moderate watering.
Common Pests & Risks
Sawfly larvae can strip foliage quickly; treat with horticultural oil or a strong water spray. Scale insects may appear on stems, controlled with white oil or systemic insecticide. Myrtle rust (Puccinia psidii) causes orange pustules on new growth; apply fungicide and prune affected parts. Monitor regularly for these pests, especially in humid conditions.
Troubleshooting
Yellow leaves: often caused by poor drainage or overwatering; improve soil and reduce watering. Brown leaf edges: usually from salt burn or dry conditions; flush soil with water and mulch. Sparse growth: insufficient sunlight; move to full sun. Leaf drop: myrtle rust infection; prune and apply fungicide. Stunted growth: nutrient deficiency; feed with native fertiliser.