White ash
Fraxinus americana · Oleaceae
📷 Virens (Latin for greening) from South Royalton, Vermont, USA · CC BY 2.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around white ash and prepare for winter.
ID card
- Foliage
- Deciduous
- Blooming
- April to May
- Adult size
- Up to 20 m in height
- Growth
- Fast to moderate
- Hardiness
- Very hardy (down to -30°C)
- Origin
- North America
- Soil type
- Deep, well-drained, neutral to slightly acidic soils
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Fraxinus americana grows quickly and vigorously in cool, well-drained soil. Plant it young (50-100 cm) and mulch 5-10 cm for the first three years.
The common mistake
Planting too large or old a specimen: establishment is slower.
The pro's trick
Mix several plants (males and females if possible) for better pollination and more abundant fruiting.
Care
Exposure
Your American ash thrives in full sun for optimal growth and a beautiful form. It also tolerates partial shade, though it will develop a less dense silhouette. Avoid overly windy exposures that can weaken its branches.
Watering
Water regularly during the first few years to encourage deep root establishment. Once established, ash resists relative drought well thanks to its developed root system. During intense heat periods, water if the soil surface dries out.
Soil and planting
Prefer deep, well-drained, fertile soil that is neutral to slightly acidic. Ash adapts to different soil textures but dreads root suffocation. Improve poor soil with compost at planting time.
Pruning and trimming
Intervene in late winter or early spring before growth resumes. Remove dead, diseased or crossing branches to maintain a nice structure. Light pruning encourages denser branching; avoid severe pruning that weakens the tree.
Fertilizing
An annual application of well-decomposed compost in early spring is generally sufficient. On poor soil, diluted balanced fertilizer can support growth. Established ash trees usually don't require regular fertilization.
Diseases and pests
Watch for ash anthracnose in humid conditions, which affects leaves and young shoots. Mealybugs and aphids can occasionally colonize branches. Maintain good hygiene by removing affected branches and promote air circulation.
Did you know?
The American ash is the national tree of the United States and plays a major ecological role in North America. Its hard and flexible wood has long been highly prized for making tool handles and baseball bats, thanks to its exceptional mechanical properties.
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
- Olive treeOlea europaea
- Wild privetLigustrum vulgare
- LilacSyringa vulgaris
- Green ashFraxinus pennsylvanica
- Narrow-leaved mock privetPhillyrea angustifolia
- California privetLigustrum ovalifolium
Tips generated and checked by Viridia — adapt them to your local climate.