Species

Dianella caeruleaBlue Flax-Lily

4 other cultivars

grass

Blue Flax-Lily

Dianella caerulea 'Little Jess'

The Story

Plant Bio

Dianella caerulea is an evergreen herbaceous perennial native to eastern Australia, where it inhabits open forests and coastal heathlands. The species forms clumps of strap-like leaves and produces branched panicles of small, star-shaped flowers followed by glossy blue berries.

'Little Jess' is a dwarf, compact cultivar distinguished by its short, upright canes that remain erect without lodging. The glossy green foliage forms a dense, non-invasive clump that reaches only 12 to 18 inches in height and width.

Uses & Benefits:

Provides year-round structural interest with its dense, glossy green strappy foliage, accented by purple flowers and metallic blue berries.

Offers exceptional drought tolerance and stabilizes soil on slopes or borders once established.

Attracts generalist insect pollinators with its spring flowers and provides food for seed-eating birds.

SpeciesDianella caeruleaBlue Flax-Lily

Essentials

At a Glance

Plant Type

Grass

Height

18"

Width

18"

Light

Full Sun, Partial Sun, Shade

Zones

8, 9, 10

Water

Low

Humidity

High

Lifespan

Perennial

Native To

Australia

Toxicity

Toxic to pets and humans

Bloom period

Spring – Summer

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun to deep shade with well-drained soil.
Dig a hole twice as wide as the root ball but equal in depth, ensuring the soil at the bottom is firm.
Position the plant so the crown sits slightly higher than the surrounding soil line to prevent water pooling.
Backfill with native soil, firm gently, and water thoroughly to settle the roots.

Pro Tip

Plant the crown slightly above the surrounding soil level to ensure drainage water sheds away from the base, preventing crown rot.

Keep It Thriving

Care Guide

Do

Water regularly during the first growing season to establish a deep root system.
Apply a balanced, slow-release fertilizer in early spring to support new foliage growth.
Cut back the foliage by half every two to three years to refresh the clump.

Don't

Do not bury the central crown under soil or heavy mulch, which induces rot.
Do not plant in poorly drained, waterlogged soils where roots will suffocate.
Do not shear the plant annually into old wood, as recovery is slow.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Mass plantingsBorder edgingUnderstory plantingCoastal gardensContainer specimens

Companion Plants

Lomandra longifolia Westringia fruticosa Anigozanthos flavidus

Multiply

Propagation Methods

Good to Know

Common Questions

Blue Flax-Lily questions

What zones can Blue Flax-Lily grow in?

Blue Flax-Lily is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Blue Flax-Lily deer resistant?

Not reliably. Deer may browse Blue Flax-Lily, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Blue Flax-Lily bloom?

Blue Flax-Lily typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Blue Flax-Lily need full sun?

Blue Flax-Lily does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Blue Flax-Lily drought tolerant?

Yes — once established (usually after the first full season), Blue Flax-Lily handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.