Alnus subcordata
Notify MeAlnus subcordata, commonly known as the Caucasian Alder, is a fast-growing deciduous tree native to the Caucasus and northern Iran. It features large, heart-shaped green leaves with serrated edges and produces slender yellow-brown catkins in late winter to early spring, followed by small, woody cone-like seed clusters in autumn. This nitrogen-fixing tree thrives in moist conditions, making it ideal for improving soil quality and stabilising wet or erosion-prone areas.
Perfect for riparian plantings, wetland restoration, or as a shade or shelterbelt tree in larger gardens and landscapes. Thrives in full sun to partial shade and prefers moist, well-draining soils but can also tolerate waterlogged areas. It grows quickly, making it a reliable choice for establishing greenery in challenging conditions.
Reaches a mature height of 20–25 m with a canopy spread of 10–12 m, forming a tall, broad tree that provides structure, shade, and environmental benefits.
Trimming: Prune in late winter or early spring to remove dead, damaged, or crossing branches. Regular pruning maintains a strong structure and encourages healthy growth.
Fertilising: Alder trees can thrive in low-nutrient soils due to their nitrogen-fixing abilities. However, a light application of balanced fertiliser in spring can benefit trees in very poor soils.
Watering: Water regularly during the establishment phase. Once established, Alders are highly tolerant of wet conditions and can thrive in waterlogged or damp soils.
Pest Control: Check for aphids on young growth. Use insecticidal soap or introduce natural predators like ladybirds to manage infestations if necessary.
Disease Management: Generally resistant to diseases but may suffer from root rot in compacted or poorly drained soils. Improve drainage and promptly remove any affected trees or branches.
Enjoy complimentary delivery anywhere in mainland New Zealand when you purchase plants worth $250 or more*.
For orders below $250, the following flat-rate delivery charges are applicable:
- Urban delivery within mainland New Zealand: $19.95
- Rural delivery within mainland New Zealand: $39.95
- Waiheke, Chatham and Great Barrier Islands: Please contact us for shipping options.
We aim to have all orders shipped within 14 days from the order date, unless a different shipping date is specified alongside a product.
