Grasstree

(Xanthorrhoea glauca)

Grasstree (Xanthorrhoea glauca)

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Summary

Xanthorrhoea glauca, commonly known as Grasstree, is an evergreen perennial that can be considered a grass or tree, endemic to the sclerophyll forests and coastal heathlands of Eastern Australia. It is a distinctive and iconic plant with a slow growth rate, often forming large, dense communities in nutrient-poor, sandy or rocky soils. The trunk, which can exceed 5 meters in height, is often blackened by past bushfires and may be multi-branched. Grasstree typically reaches a height of 2-4 meters with a width of 1-2 meters. Its leaves are long, narrow, and arching, with a striking grey or bluish glaucous green color. The plant is renowned for its dramatic flower spikes that can reach up to 2 meters in height, bearing numerous small, white and brown flowers that bloom mainly in the summer but can also appear in fall and winter, attracting a variety of pollinators.

Grasstree is valued for its unique form and textural contrast in gardens, and it is often used as a focal point or in rockeries and native plantings. It is highly drought-tolerant, requiring minimal water once established, and thrives in well-drained soils with full sun to part shade exposure. While it is generally low-maintenance, it can be susceptible to root rot if overwatered or planted in poorly drained soils. Grasstree is also adapted to survive bushfires, with its thick, insulating bark protecting the growth point. After a fire, it can resprout vigorously, an adaptation that can be mimicked in cultivation by careful application of smoke water or fire-related cues to stimulate flowering.CC BY-SA 4.0

Plant Description

  • Plant Type: Grass
  • Height: 8-12 feet
  • Width: 6-8 feet
  • Growth Rate: Slow
  • Flower Color: White, Brown
  • Flowering Season: Summer, Fall, Winter
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Full Sun, Part Shade
  • Water: Low
  • Drainage: Fast

Common Uses

Bee Garden, Bird Garden, Butterfly Garden, Low Maintenance, Showy Flowers

Natural Habitat

Sclerophyll forests and coastal heathlands of Eastern Australia

Other Names

Common Names: Grass Gum-Tree, Kangaroo Tail

Scientific Names: , Xanthorrhoea glauca,

GBIF Accepted Name: Xanthorrhoea glauca D.J.Bedford