How to grow soft tree fern
Overview
Dicksonia antarctica is a slow-growing, long-lived tree fern with a fibrous trunk and large, dark green fronds. It is grown for its striking architectural foliage in moist, shaded gardens. The key to success is never letting the trunk or crown dry out, especially during warm weather.
Soil Preparation
Prefers moist, well-drained soil rich in organic matter, with a pH around 5.5–6.5. Amend with compost or leaf mould before planting. Ensure good drainage but high moisture retention; avoid waterlogged clay.
Growing Guide
Plant in a sheltered, bright but shaded position with consistently moist soil. Avoid deep dry shade or hot, exposed sites. Dig a hole large enough for the root ball, backfill with rich organic matter, and water in thoroughly. Space at least 2 m apart to allow for frond spread. Keep the trunk and crown damp by misting or a slow-drip system during dry spells.
Care
Feed in spring with a balanced liquid fertiliser diluted to half strength. No pruning needed; remove only dead or damaged fronds. Maintain trunk moisture by misting or a slow-drip system during dry spells.
Companion Planting
Good companions include other shade-loving ferns (Blechnum, Asplenium), hostas, and rainforest trees like Syzygium. Avoid planting near plants that require dry, sunny conditions or compete for moisture.
Common Pests & Risks
Scale insects can infest the trunk and fronds, causing yellowing and dieback. Treat with horticultural oil or white oil on affected areas. Drying conditions can also cause frond browning; maintain high humidity and consistent soil moisture to prevent this.
Troubleshooting
Yellowing fronds: scale infestation or dry soil. Check for scale and increase watering. Brown frond tips: low humidity or dry trunk. Mist regularly and maintain soil moisture. Slow growth: poor light or nutrient deficiency. Move to brighter shade and feed in spring. Trunk rot: overwatering or poor drainage. Ensure soil is moist but not waterlogged.