Grass Tree
Xanthorrhoea johnsonnii
Johnson's Grass Tree
About this plant
Xanthorrhoea johnsonnii, commonly called Johnson's Grass Tree, is a unique Australian plant known for its thick, rough trunk and long, grass-like leaves. It grows slowly and can live for many years. The plant produces tall flower spikes that attract birds and insects. It is often used in gardens for its striking appearance and drought resistance.
Taxonomy
- Genus
- Xanthorrhoea
- Family
- Asphodelaceae
- Higher classification
- Order: Asparagales
- Plant type
- Shrub
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Australia
- Distribution
- Native to eastern Australia, especially Queensland and New South Wales; cultivated in similar climates worldwide.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, East-facing, West-facing
- Watering frequency
- Rare
- Watering interval
- 14–21 days
- Humidity
- Low
- Minimum
- 5 °C
- Maximum
- 40 °C
- Optimal
- 15-30 °C
- USDA hardiness zones
- 9-11
- Soil pH
- 5.5-6.5
- Soil type
- well-draining sandy or loamy soil
Watering. Water deeply but infrequently, allowing soil to dry out between waterings. Avoid waterlogging to prevent root rot.
Fertilizing. Feed lightly in spring with a balanced, slow-release fertilizer. Avoid over-fertilizing as it prefers low-nutrient soils.
Xanthorrhoea johnsonnii is a hardy plant that prefers sunny spots and well-draining soil. It is drought tolerant and does not need frequent watering. Avoid overwatering to prevent root problems. It grows slowly and requires minimal maintenance once established.
Propagation
- Propagation methods
- Seeds, Cuttings
- Care difficulty
- Medium
Ornamental features
- Flowering
- Yes
- Flowering period
- spring
Thick trunk with rough bark, long narrow leaves, and tall flower spikes with small cream flowers.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Not considered a weed
Non-toxic to humans and pets; safe to have around children and animals.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Sap or latex
- Pollen level
- Low
Xanthorrhoea johnsonnii is not known to cause allergies. People sensitive to plant pollen or sap generally do not have reactions to this plant. It is safe to handle with normal care.
Common problems
Overwatering can cause root rot. Poor drainage or too much shade may stunt growth. Occasionally, pests like scale insects can appear but are usually manageable.
Uses
Primarily ornamental for gardens and landscaping, especially in dry or Mediterranean climates. Its unique form adds architectural interest.
Notes
Prune dead leaves carefully to avoid damaging the trunk. Repotting is rarely needed due to slow growth. Protect from frost in colder areas.