How to Grow Tasmanian Flax Lily
Wikimedia Commons
Tasmanian Flax Lily
Dianella tasmanica
grassDianella tasmanica is a clumping ornamental grass native to Tasmania and southeastern Australia, valued for its attractive strappy green foliage and small blue flowers. It produces distinctive bright blue berries that persist through seasons, adding visual interest to gardens. This evergreen perennial is hardy, low-maintenance, and ideal for modern landscape designs.
When should you plant Tasmanian Flax Lily in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Tasmanian Flax Lily timeline · Pittsburgh, PA (Zone 6b)
-
Plant Tasmanian Flax Lily
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Tasmanian Flax Lily
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Tasmanian Flax Lily dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8b-11, tolerates some frost in zone 8a
Sign up free to see if Tasmanian Flax Lily grows in your zone — and get a personalized planting timeline.
Get my Tasmanian Flax Lily timeline →Growth Stages
Establishment
3-6 monthsYoung plant with emerging clumps of narrow, strappy green foliage, 12-18 inches tall
Water regularly to establish root system. Mulch around base to retain moisture. Protect from extreme heat in first season.
Vegetative Growth
6-12 monthsPlant develops fuller clumps with increasing foliage density, reaching 24-36 inches tall and wide
Maintain consistent watering. Deadhead spent flowers if desired. Minimal pruning needed. Fertilize lightly in spring with balanced fertilizer.
Flowering
4-8 weeks (spring-summer)Small delicate purple-blue flowers appear in loose panicles above the foliage in late spring to early summer
Flowers are self-fertile and attract pollinators. Leave spent flowers if berries are desired. Provide adequate water during blooming.
Fruiting
6-12 months (berries persist)Flowers develop into striking bright blue berries that persist on the plant for extended periods
Berries are ornamental and attract birds; leave on plant for visual appeal. No intervention needed. Berries persist through fall and into winter.
Mature/Evergreen
Indefinite (perennial)Fully established plant maintains green foliage year-round; evergreen in all but coldest zones
Minimal maintenance required. Remove any dead or damaged foliage. Cut back old flower stems if desired for tidiness. Divide clumps every 3-5 years if needed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with water to dislodge; use miticide if severe. Ensure adequate humidity around plant.
-
Inspect regularly and remove by hand. Use horticultural oil spray in early spring before new growth.
-
and
Remove debris and mulch that harbor pests. Use slug traps or barriers; hand-pick in early morning.
Uses
Garden Landscaping & Design
OrnamentalExcellent as a focal point or accent plant in modern, Mediterranean, and drought-tolerant landscapes. The blue berries and strappy foliage add vertical interest and color contrast to garden beds. [source]
Wildlife Attraction
WildlifeThe bright blue berries are highly attractive to birds and native wildlife, providing food during fall and winter months. Flowers attract beneficial insects and pollinators. [source]
Cut Flowers & Arrangements
HouseholdStrappy foliage and berries are excellent for floral design and long-lasting cut flower arrangements. Both green stems and dried seed heads are useful for flower arrangers. [source]
Edible Berries (Aboriginal Use)
CulinaryHistorically used by Indigenous Australians as a food source. Berries are edible and were consumed fresh or dried, though rarely cultivated specifically for this purpose today. [source]
Dried Arrangements & Craft
CraftSeed heads dry well and retain color and form, making them suitable for dried flower arrangements, wreaths, and dried botanical crafts. [source]
Harvest Tips
Dianella tasmanica is ornamental; berries are not edible for humans but are prized for visual interest. Cut foliage for floral arrangements at any time. Harvest dried seed heads in fall-winter. Allow berries to persist on plant for landscape interest and wildlife food.
Fun Facts
- 🌱 Dianella tasmanica is native to Tasmania and southeastern Australia, where it naturally grows in woodlands, grasslands, and rocky areas.
- 🌱 The bright blue berries are a favorite food of native Australian birds including currawongs and magpies, which help disperse seeds naturally.
- 🌱 The plant's name 'Dianella' comes from Diana, the Roman goddess, though the origin of the specific epithet reference is unclear; 'tasmanica' refers to its Tasmanian origins.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Tasmanian Flax Lily planting timeline
Tell us your zip code and we'll calculate exactly when to start Tasmanian Flax Lily seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Tasmanian Flax Lily timeline →