How to grow davidson plum
Overview
Davidson plum (Davidsonia pruriens) is a rainforest shrub or small tree from subtropical eastern Australia. It is grown for its ornamental fern-like foliage and its tart, dark purple fruit used in jams and sauces. Key to success is providing consistent moisture, shelter from frost, and part-shade conditions.
Soil Preparation
Davidson plum prefers slightly acidic to neutral soil (pH 5.5–6.5) that is deep, fertile, and well-drained. Enrich the planting hole with well-rotted compost and aged manure. Avoid heavy clay or waterlogged sites; improve drainage with raised beds if necessary.
Growing Guide
Plant Davidson plum in a sheltered, part-shade position with deep, well-drained soil rich in organic matter. Space plants 3–4 m apart to allow for their spreading canopy. Water regularly to keep the soil consistently moist, especially during dry spells, but avoid waterlogging. Apply a thick layer of organic mulch to keep roots cool and suppress weeds. Protect young plants from strong winds and heavy frost with shade cloth or a temporary cover.
Sowing
Seeds are slow to germinate and require fresh seed and consistent warmth. Sow 1 cm deep in a seed-raising mix, keep moist, and place in a warm, shaded spot. Germination can take 4–12 weeks. Transplant seedlings when they reach 15–20 cm tall.
Care
Feed in spring and summer with a balanced organic fertiliser, such as a slow-release native blend. Prune lightly after harvest to remove dead wood and shape the canopy. Maintain a thick mulch layer year-round to buffer soil temperature and retain moisture.
Companion Planting
Plant near other rainforest species like macadamia, finger lime, and native ginger for a compatible understory. Avoid planting near heavy feeders or plants that require full sun and dry conditions, such as eucalyptus or acacia, as they will compete for moisture and light.
Common Pests & Risks
Fruit fly can be a major pest on Davidson plum; use exclusion bags or fine netting over developing fruit. Birds will also take ripe fruit, so netting is essential for a full harvest. Monitor for scale insects on stems and treat with horticultural oil if needed.
Harvesting
Harvest fruit when it turns a deep purple-black and softens slightly, usually from late summer to autumn. Collect fallen fruit promptly from the ground or pick directly from the tree. The fruit is very tart and best processed soon after harvest for jams, sauces, or cordials.
In the Kitchen
The fruit is very tart and is best used for jams, sauces, chutneys, and cordials. It can also be frozen for later use. The flesh is high in pectin, making it ideal for preserves without added pectin.
Troubleshooting
Yellow leaves: often from waterlogging or poor drainage; improve soil or move to a better-drained spot. Brown leaf edges: caused by dry air or wind scorch; increase humidity and shelter. Stunted growth: may indicate insufficient organic matter or a lack of nutrients; top-dress with compost. Fruit drop before ripe: can be from inconsistent watering; maintain steady moisture. Leaf spot: fungal issue in humid conditions; improve air circulation and avoid overhead watering.