How to grow lemon-scented gum
Overview
Lemon-scented gum (Corymbia citriodora) is a fast-growing evergreen tree with a smooth, pale trunk and narrow, lemon-scented leaves. It is grown for its elegant form, dappled shade, and aromatic foliage, and needs ample space to reach its full potential.
Varieties
- Corymbia citriodora 'Dwarf' — Compact form reaching 6–8 m, ideal for smaller gardens.
- Corymbia citriodora 'Scentuous' — Selected for strong lemon fragrance and narrow habit.
Soil Preparation
Prefers slightly acidic to neutral pH (6.0–7.0) and well-drained loam or sandy soil. Amend heavy clay with gypsum and organic matter to improve drainage. Avoid waterlogged sites.
Growing Guide
Plant in full sun in well-drained soil; space at least 8–10 m from buildings. Dig a hole twice the width of the root ball, backfill with native soil, and water deeply. Stake young trees for the first year. Do not overwater—allow the soil to dry between waterings to prevent root rot.
Sowing
Sow seeds 5 mm deep in seed-raising mix, keep moist and warm (20–25°C). Germination takes 14–21 days. Direct sow in final position or transplant when 30 cm tall. Best started in spring or early summer.
Care
Feed with a slow-release native fertiliser in early spring and again in autumn. Prune lightly after flowering to remove dead or damaged branches and maintain shape. Monitor for borers and treat promptly if needed.
Companion Planting
Underplant with low-growing native shrubs like Grevillea, Callistemon, or Westringia to create a layered, firewise garden. Avoid planting near pipes or foundations due to invasive roots.
Common Pests & Risks
Borers (especially in stressed trees) and leaf-chewing insects like psyllids and sawfly larvae may attack. Keep trees well-watered and fertilised to reduce borer risk; treat with systemic insecticide if infestation is severe.
Harvesting
Harvest not relevant.
Troubleshooting
Yellow leaves: overwatering or poor drainage—reduce water and improve soil. Brown leaf edges: frost damage or salt burn—protect from cold and flush soil. Stunted growth: nutrient deficiency—apply native fertiliser. Leaf drop: drought stress—increase watering frequency. Borer holes: stress or injury—keep tree healthy and treat with systemic insecticide.