Treegrass Plant Care
Xanthorrhoea arborea R.Br.
Updated · Sources · How we source care data
Xanthorrhoea arborea a species of grasstree of the genus Xanthorrhoea native to New South Wales and Queensland. It was one of the many species authored by the Scottish botanist Robert Brown.
Every 14–21 days
Full sun
50–85°F
30–60%
At a glance
How do you care for Treegrass?
Water Treegrass every 14–21 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 50–85°F (10–29°C) and 30–60% humidity.
Where Is the Treegrass Native To?
What Is the Treegrass?
Treegrass (Xanthorrhoea arborea) belongs to the Asphodelaceae family within the Xanthorrhoea genus. Treegrass is native to New South Wales and Queensland. Treegrass is also known as Blackboy, Grass Tree.
Treegrass displays a slow-growing, clumping perennial growth habit, reaching up to 6 ft tall with a spread of approximately 3 ft. Treegrass produces tall spikes of creamy white flowers.
Leaf size: approximately 36 inches.
How Often Should You Water a Treegrass?
Xanthorrhoea arborea requires watering every 14–21 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 14–21 days
Let soil partially dry between waterings
What Light Does the Treegrass Need?
Treegrass thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Treegrass Prefer?
Xanthorrhoea arborea grows best at temperatures of 50–85°F. Treegrass prefers humidity levels of 30–60%.
Temperature
50–85°F
Humidity
30–60%
What Soil Mix Works Best for a Treegrass?
Sandy, well-draining soil mix with low organic content. Good drainage is essential for Treegrass to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Treegrass?
Repot every 3-5 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Treegrass?
Treegrass can be propagated through seeds, offsets. Similar propagation techniques also apply to balga plant care, which shares the same genus.
Is the Treegrass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Treegrass, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Treegrass?
Treegrass is susceptible to mealybugs, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Treegrass Need?
Treegrass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Treegrass is native to New South Wales and Queensland. In cooler regions, grow Treegrass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Treegrass is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Xanthorrhoea genus — compare its care with other Xanthorrhoea species on PlantoScan.
Xanthorrhoea is part of the Asphodelaceae plant family — browse all Asphodelaceae genera and species.
Treegrass thrives in bright light and direct sun — see other bright-light plants.
More Xanthorrhoea Species
Other Xanthorrhoea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Xanthorrhoea arborea R.Br., family Asphodelaceae (first published in Prodr. Fl. Nov. Holland. : 288 (1810)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Treegrass, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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