Tasman Flax-lily (Dianella tasmanica)

Tasman Flax-lily

Dianella tasmanica

A hardy evergreen perennial with strap-like leaves and striking blue berries, adding architectural elegance to gardens. Other names: Flax lily.

Prefers partial shade to full sun; foliage color is best with some direct sunlight but appreciates afternoon shade in hot climates.
1/week
Easy
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Plant Needs

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Sunlight Prefers partial shade to full sun; foliage color is best with some direct sunlight but appreciates afternoon shade in hot climates.
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Watering Drought tolerant once established; water deeply but infrequently, allowing the topsoil to dry out between waterings.
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Temperature Hardy in warm temperate to subtropical climates; tolerates light frosts but may suffer foliage damage in severe freezes.
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Characteristics

  • Leaves: Evergreen, strap-shaped, linear to lanceolate, leathery, with finely serrated and often rough margins, growing in dense basal clumps;
  • Flowers: Star-shaped, nodding, pale blue to violet tepals with prominent yellow stamens, borne on loose, branched panicles extending above the foliage;
  • Fruit: Fleshy, globose to oblong berries, turning a striking bright metallic blue or purple when ripe;
  • Rhizomes: Spreading underground rhizomes that form dense, robust clumps over time.
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Care Guide

Watering

Water moderately during the active growing season, allowing the top inch of soil to dry out.

Fertilization

Apply a balanced, slow-release fertilizer at the beginning of the growing season.. Avoid over-fertilizing, which can lead to excessive foliage growth at the expense of flowers and berries.

Banana Peel Tea:Steep chopped banana peels in water for 24-48 hours. Strain and use the liquid to water the base of the plant. This provides a gentle potassium boost to support root health and berry development. Discard the peels in compost to avoid attracting pests.
Pruning
  • Remove dead, damaged, or yellowing leaves at the base to maintain a tidy appearance;
  • Cut back spent flower stalks down to the foliage line after the berries have dropped or shriveled;
  • Divide large, congested clumps every 3-4 years in early spring to rejuvenate the plant.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: May cause mild gastrointestinal irritation if leaves or berries are ingested (per ASPCA guidelines for similar saponin-containing plants).

Humans: Berries can cause mild gastrointestinal upset if ingested in large quantities.

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Garden Uses & Culture

Culture: In Western landscaping, it is highly prized for its architectural form and drought tolerance, frequently utilized in modern, minimalist, and xeriscape garden designs.

Usage: Ornamental landscaping, border planting, mass planting, container gardening, and erosion control on slopes.