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Xanthorrhoea
Also called Blackboys
Grass trees (Xanthorrhoea) are a genus of about 30 slow-growing, succulent-based perennials from Australia, with clumps of grass-like leaves on a rough trunk. The most commonly grown garden species are X. australis, X. malacophylla and X. preissii, and the key to growing them is very free-draining, low-nutrient soil with little water.
Xanthorrhoea () is a genus of about 30 species of succulent flowering plants in the family Asphodelaceae. They are endemic to Australia. Common names for the plants include grasstree, grass gum-tree (for resin-yielding species), kangaroo tail, balga (Western Australia), yakka (South Australia), yamina (Tasmania, from the palawa kani language), and black boy (or "blackboy"). The most common species is Xanthorrhoea australis, and some of these names are applied specifically to this species.
Xanthorrhoea may be cultivated, as seed is easily collected and germinated. While they do grow slowly, quite attractive plants with short trunks (10 centimetres or 3.9 inches) and leaf crowns up to 1.5 metres or 4 feet 11 inches (to the top of the leaves) can be achieved in 10 years. The slow growth rate means that it can take 30 years to achieve a specimen with a significant trunk. Most Xanthorrhoea sold in nurseries are established plants taken from bushland. Nurseries charge high prices for the plants. However, there is a very low survival rate for nursery-purchased plants (mainly due to over watering), which may take several years to die. The most successful examples of transplanting have been where a substantial amount of soil, greater than one cubic metre (35 ft3), has been taken with the plants.
Xanthorrhoea is an iconic plant that epitomizes the Australian bush in its ability to live in poor nutrient soils and respond to wildfire.
Grasstrees grow in coastal heaths, and wet and dry forests of Australia. They are drought and frost tolerant. The grass tree mainly occurs in soils that are very free draining and consequently low in nutrients. It survives in the poorest soils, with a shallow root system, enabling it to easily access nutrients from decaying litter, while storing all the food reserves in its stem.
Xanthorrhoea is important to the Aboriginal peoples. It is a highly-valued resource with many uses. The flowering spike may be utilised as the lightweight handle of a composite spear with a hardwood sharp shaft inserted into the end. It is also soaked in water and the nectar from the flowers gives a sweet-tasting drink.
Text excerpted from the Wikipedia article Xanthorrhoea by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
