How to grow tasman flax lily
Overview
Tasman flax lily is a clumping, strappy perennial from the Asphodelaceae family, valued for its graceful foliage and soft texture in shaded borders. It thrives in consistently moist soil and part shade, and is often used to add rhythm and movement to garden beds.
Varieties
- Dianella tasmanica 'Variegata' — White-striped leaves, adds bright contrast in shade.
- Dianella tasmanica 'Little Rev' — Compact form, ideal for borders and pots.
Soil Preparation
Prefers slightly acidic to neutral soil (pH 5.5–7.0) with good organic matter. Enrich with compost or well-rotted manure before planting. Ensure drainage is adequate; heavy clay can be improved with gypsum or raised beds.
Growing Guide
Plant in well-drained, humus-rich soil in part shade, avoiding hot afternoon sun. Space clumps 40–60 cm apart for a dense border. Keep soil consistently moist during the first growing season; established plants tolerate brief dry spells. Mulch with organic matter to retain moisture and suppress weeds.
Care
Feed in early spring with a slow-release native fertiliser low in phosphorus. Cut back old or damaged foliage in late winter to encourage fresh growth. Divide clumps every 3–4 years to maintain vigour and prevent overcrowding.
Companion Planting
Good companions include native violet (Viola banksii), ferns, and other shade-loving plants like liriope or hellebores. Avoid planting near aggressive, spreading grasses that may compete for moisture.
Common Pests & Risks
Snails and slugs may chew foliage, especially in damp conditions; control with iron-based baits or hand-picking. Leaf spot can occur in humid weather; improve air circulation and avoid overhead watering. Treat with copper fungicide if needed.
Troubleshooting
Yellow leaves: often from overwatering or poor drainage; reduce water and check roots. Brown leaf tips: caused by dry air or low humidity; mist or increase shade. Leaf spot: fungal issue in wet weather; space plants and avoid overhead watering. Slow growth: too much shade or poor soil; move to brighter spot or add compost. Snail damage: ragged holes in leaves; use baits or hand-pick.