Australian pine
Casuarina equisetifolia · Casuarinaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around australian pine and prepare for winter.
ID card
- Foliage
- Evergreen, very fine and airy resembling needles
- Flowering
- Spring to summer, discreet flowers
- Adult size
- 15 to 20 m in height, upright and slender form
- Growth
- Fast to moderate depending on conditions
- Hardiness
- Low hardiness, tropical to subtropical climate (zones 10-12)
- Origin
- Australia, Oceania and Southeast Asia
- Soil type
- Well-drained soils, tolerates poor and saline terrains
Care
Watering
Water regularly during the first year of establishment to promote root development. Once established, ironwood tolerates drought thanks to its deep root system. In hot and dry regions, water moderately during the summer period. Avoid excess water which can cause root problems.
Sunlight
Install the ironwood in full sun for optimal growth. This species requires at least 6 to 8 hours of direct light daily. It accepts partial shade in very hot climates, but growth will be slowed.
Pruning and training
Pruning is not essential as the tree naturally adopts an elegant and slender shape. Remove dead, diseased or poorly oriented branches in late winter. You can thin out the canopy to let light through if necessary.
Soil preparation
Ironwood adapts to most soils provided they are well-drained. It exceptionally tolerates sandy, poor or saline soils, making it ideal for coastal areas. Improve heavy soils by adding sand and organic amendments.
Fertilizing
Regular fertilization is not essential, but it can accelerate growth. Apply a balanced fertilizer in spring and early summer. Reduce applications in autumn and winter. Prefer moderate applications rather than large doses.
Diseases and pests
Ironwood is generally very resistant to diseases. Watch for root rot in case of poorly drained soils or excessive watering. Pests remain rare in optimal conditions. Ensure good air circulation around the tree to prevent fungal problems.
Did you know?
Ironwood (Casuarina equisetifolia) owes its name to the exceptional hardness of its wood, as hard as wrought iron, which is why it has traditionally been used in carpentry, shipbuilding and for posts. Its extraordinary foliage, made up of small flattened branchlets, gives it a unique and airy silhouette that resembles a conifer, although it is not one: this remarkable morphological adaptation allows it to reduce evapotranspiration in hot and dry climates.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- Allocasuarina littoralisAllocasuarina littoralis
- Allocasuarina verticillataAllocasuarina verticillata
- Forest-oakAllocasuarina torulosa
- River sheoakCasuarina cunninghamiana
- Bull-oakAllocasuarina luehmannii
- Gray sheoakCasuarina glauca
Tips generated and checked by Viridia — adapt them to your local climate.