How to grow blue flax lily
Overview
Blue flax lily is a clumping, strappy perennial grown for its fine-textured foliage and delicate blue flowers, providing movement and soft structure in garden beds. It thrives in bright, filtered light with well-drained soil and minimal water once established.
Varieties
- Dianella brevipedunculata 'Little Jess' — Compact dwarf form, 30 cm tall, ideal for borders and pots.
- Dianella brevipedunculata 'Breeze' — Fine-leafed, wispy habit, good for mass planting under trees.
Soil Preparation
Prefers slightly acidic to neutral pH (6.0–7.0). Tolerates poor soils but thrives in sandy loam with added organic matter. Ensure sharp drainage; raised beds help in heavy clay.
Growing Guide
Plant in part-shade to morning sun, avoiding harsh afternoon exposure. Space 30–40 cm apart for dense cover. Prepare free-draining soil; incorporate coarse sand or gravel if clay. Water sparingly after planting, then only during prolonged dry spells. Mulch lightly to retain moisture without causing rot.
Care
Feed with slow-release native fertiliser in early spring. Cut back old foliage to 10 cm in late winter to rejuvenate. Divide clumps every 3–4 years to maintain vigour and prevent centre dieback.
Companion Planting
Pair with Lomandra longifolia for similar texture, Scaevola aemula for groundcover contrast, and Westringia fruticosa for a low hedge. Avoid planting near heavy feeders like citrus that demand frequent watering.
Common Pests & Risks
Generally pest-free; watch for scale insects on older leaves in humid subtropical zones. Treat with horticultural oil or soap spray. Snails may damage new growth in cool, wet springs.
Troubleshooting
Yellow leaves: overwatering or poor drainage – reduce water and check soil. Brown leaf tips: dry air or salt buildup – flush soil with rainwater. Sparse growth: too much shade – move to brighter spot. Centre dieback: old clump needs division – split every 3–4 years.