How to grow aniseed myrtle
Overview
Aniseed myrtle is a rainforest shrub native to northern NSW and southern QLD, valued for its aromatic leaves that taste of aniseed and licorice. It grows as a dense, bushy plant reaching 3–5 metres, and is used both as a culinary herb and an ornamental screen. Key for success: shelter from strong winds and consistent moisture without waterlogging.
Varieties
- Syzygium anisatum — The standard species, widely available in nurseries across eastern Australia.
Soil Preparation
Prefers well-drained, loamy soil with a pH of 5.5–6.5. If soil is heavy clay, raise the planting bed or add gypsum and compost to improve drainage. Incorporate a handful of blood and bone or aged chicken manure into the planting hole for a slow-release nitrogen boost.
Growing Guide
Plant in a sheltered position with dappled morning sun and protection from hot afternoon rays. Space 2–3 metres apart for a hedge or 4 metres as a specimen. Dig a hole twice the width of the root ball, backfill with native soil mixed with well-rotted compost, and water in deeply. Apply a 5–7 cm layer of organic mulch around the base, keeping it clear of the trunk. For container growing, use a 40–50 cm pot with quality potting mix and ensure drainage holes are clear.
Sowing
Sow fresh seed 5 mm deep in a seed tray with moist seed-raising mix, keeping at 20–25°C. Germination takes 3–6 weeks; transplant seedlings to individual pots when 10 cm tall. Direct sowing is not recommended due to slow establishment.
Care
Feed with a slow-release native fertiliser (low phosphorus) in early spring and again in late summer. Prune after each harvest to maintain a compact shape and remove any dead or crossing branches. Reapply mulch annually in autumn to keep roots cool and moist.
Companion Planting
Grow with other rainforest species like lemon myrtle, native ginger, and blueberry ash for a layered, productive understorey. Avoid planting near eucalypts or grevilleas that may compete for moisture or attract psyllids. Keep away from invasive grasses that can smother young plants.
Common Pests & Risks
Myrtle rust (Puccinia psidii) causes orange pustules on new growth; control with copper fungicide at first sign and prune affected branches. Psyllids cause pimple-like leaf galls; treat with horticultural oil or neem spray in early spring. Scale insects may appear on stems; remove with a soft brush or apply white oil.
Harvesting
Harvest mature leaves from the outer canopy as needed, ideally in the morning after dew has dried for strongest flavour. Leaves can be picked fresh or dried in a low oven (50°C) for 2–3 hours and stored in an airtight jar. Regular light harvesting encourages bushy regrowth.
In the Kitchen
Use fresh or dried leaves in teas, syrups, and as a spice in desserts and savoury dishes. The aniseed flavour intensifies when dried; store in a sealed jar away from light. Leaves can be steeped in hot water for 5 minutes to make a refreshing herbal tea.
Troubleshooting
Yellow leaves: overwatering or poor drainage – reduce watering and check soil. Brown leaf edges: windburn or salt spray – move to a more sheltered spot. Stunted growth: phosphorus deficiency – apply a native-specific fertiliser. Leaf drop after frost: protect with frost cloth or move container indoors. Sparse foliage: insufficient light – increase to at least 4 hours of dappled sun.