Tasmanian flax-lily
Dianella tasmanica · Asphodelaceae
📷 Christian Hummert (Ixitixel) · CC BY-SA 3.0
The gardener's calendar
Ideal time to plant tasmanian flax-lily: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, linear and arching
- Flowering
- May to July, blue to purple flowers
- Adult size
- 80 cm tall, bushy habit
- Hardiness
- Moderate, grow in temperate or Mediterranean regions
- Origin
- Tasmania and southeastern Australia
- Growth rate
- Moderate to fast
- Soil type
- Well-drained, preferably light
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Dianella is a hardy, grass-like perennial that loves sun and well-drained soil. Once established, it handles summer drought really well.
The common mistake
People treat it like an 'exotic' plant that needs fussing over with watering—don't. It actually suffocates in soil that's too rich and too wet, and the rhizomes slowly rot.
The pro's trick
Divide every 4-5 years in spring (April): aging clumps get hollow in the middle, and dividing rejuvenates the plant while giving you easy propagation.
Care
Watering
Water regularly during growth period (spring-summer), keeping the soil moist without waterlogging. Reduce watering in autumn-winter, but never let the substrate dry out completely. In containers, check soil moisture before watering.
Light exposure
Place your Dianella in full sun for abundant flowering and compact habit. It also tolerates light partial shade, but flowers will be fewer. A bright location promotes the intense blue of the blooms.
Soil and substrate
Use well-drained, light soil that is slightly acidic to neutral. Mix leaf mold and sand to improve drainage in pots. Avoid water accumulation at the base, which promotes root rot.
Pruning and maintenance
Remove spent flowers and dry or damaged leaves throughout the season. In late winter, lightly thin out the clump to aerate the center. No drastic pruning needed: the plant has a naturally graceful form.
Fertilizing
Apply balanced fertilizer or one slightly enriched in potassium in spring and early summer, every 3-4 weeks. Cut back drastically in autumn-winter. Moderate feeding is sufficient for this hardy plant.
Diseases and pests
Beware of excess moisture, which can promote rot and fungal diseases. Watch for spider mites in dry, hot climates. Space out watering and improve air circulation if problems occur.
Did you know?
Dianella tasmanica originates from the rainforests of Tasmania and southeastern Australia, where it naturally grows on shaded forest edges. Its small metallic blue berries are highly appreciated by Australian birds, which ensure its natural dispersal. In Europe, this elegant exotic-looking grass has become established in Mediterranean and temperate gardens as a reliable and low-maintenance perennial.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Blueberry lilyDianella revoluta
- Cerulean flaxlilyDianella caerulea
- New Zealand flaxPhormium tenax
- Tree aloeAloe arborescens
- Lemon daylilyHemerocallis lilioasphodelus
- King's-spearAsphodeline lutea
Tips generated and checked by Viridia — adapt them to your local climate.