River She-oak
Casuarina cunninghamiana
Cunninghamiana
About this plant
Casuarina cunninghamiana, commonly known as River She-oak, is a fast-growing evergreen tree with slender, needle-like branchlets that resemble pine needles. It is often used for windbreaks, erosion control, and shade. The tree has a distinctive wispy appearance and can grow quite tall. It is native to Australia and adapts well to various soils and climates.
Taxonomy
- Genus
- Casuarina
- Family
- Casuarinaceae
- Higher classification
- Order Fagales
- Plant type
- Tree
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Australia
- Distribution
- Native to eastern Australia; widely planted in other warm regions including parts of Africa, Asia, and the Americas.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing, East-facing
- Watering frequency
- Moderate
- Watering interval
- 7–14 days
- Humidity
- Normal
- Minimum
- 5 °C
- Maximum
- 40 °C
- Optimal
- 15-30 °C
- USDA hardiness zones
- 9-11
- Soil pH
- 6.0-7.5 (neutral to slightly acidic)
- Soil type
- well-draining loam or sandy soil
Watering. Water regularly during the first year to establish roots. Once established, the tree is drought tolerant and needs less frequent watering.
Fertilizing. Fertilize young trees in spring with a balanced, slow-release fertilizer to support growth. Mature trees usually do not require much fertilizing unless soil is poor.
Casuarina cunninghamiana is a hardy tree that grows quickly and tolerates drought once established. It prefers full sun but can handle some shade. It needs well-draining soil and moderate watering, especially when young. Watch for root rot if overwatered or planted in poorly drained soil.
Propagation
- Propagation methods
- Seeds, Cuttings
- Care difficulty
- Medium
Ornamental features
- Flowering
- Yes
- Flowering period
- spring
Wispy, needle-like foliage giving a soft texture; small cone-like fruit; tall, slender form.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Low spread
Non-toxic to humans and pets. Safe to plant around children and animals.
Allergy information
- Allergy risk
- Moderate
- Allergy triggers
- Pollen
- Pollen level
- Moderate
Casuarina cunninghamiana produces pollen that can cause allergic reactions in sensitive individuals, especially during its flowering season. People with pollen allergies may experience sneezing, itchy eyes, or runny nose. To reduce exposure, avoid being near the tree when it is releasing pollen and keep windows closed during high pollen times.
Common problems
Overwatering can cause root rot. In dry conditions, leaves may brown. Young plants may be vulnerable to pests like aphids.
Uses
Used as a shade tree, windbreak, and for erosion control. Also valued for its timber and ornamental qualities.
Notes
Prune young trees to shape and remove dead branches. Avoid planting too close to buildings due to extensive root systems. Suitable for large outdoor spaces.