Green ash
Fraxinus pennsylvanica · Oleaceae
📷 Jerzy Opioła · CC BY-SA 3.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around green ash and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- April to May
- Mature size
- 12 m in height
- Growth
- Fast
- Hardiness
- Very hardy (down to -30°C)
- Origin
- North America
- Family
- Oleaceae
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Red ash establishes slowly in its first year. Plant it young (1-2 years old), preferably in autumn.
The common mistake
Large specimens ready for instant effect rarely recover well and often stagnate after planting.
The pro's trick
In February, gradually cut lower lateral stems (up to 2-3 m) over 2-3 years.
Seasonal watch
August-September: watch out for drought periods.
Care
Exposure
The Red Ash thrives in full sun and tolerates partial shade well. Plant it in an open location that receives at least 6 hours of direct light daily for optimal growth and a beautiful crown structure.
Watering
Although the Red Ash is moderately water-demanding, regular watering is important during the first year after planting. Keep the soil moist but well-draining, and reduce watering once the tree is established, except during prolonged dry periods.
Soil and Planting
Prefer deep, well-draining soil that is slightly acidic to neutral. The Red Ash adapts to various soil textures but dislikes chronic waterlogging. Enrich the planting hole with mature compost to encourage rooting.
Pruning and Trimming
Pruning is not essential, as this ash naturally develops a beautiful shape. Remove dead, diseased, or poorly oriented branches in late winter to encourage a solid structure and prevent branching problems.
Fertilizing
A balanced fertilizer application in spring and early summer supports vigorous growth of the young tree. After establishment (2-3 years), red ashes are undemanding and draw their nutrients from soil rich in organic matter.
Pests and Diseases
The Red Ash can be affected by anthracnose and certain pests such as aphids. Ensure good crown aeration and remove affected branches. Currently, the Emerald Ash Borer is a major concern in North America: monitoring is recommended depending on your region.
Did you know?
The Red Ash owes its common name to the reddish tint of its buds and flowers, visible in spring. An emblematic North American species, it has become a highly prized ornamental tree in Europe and adapted to urban conditions thanks to its remarkable resilience and rapid growth.
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
- Narrow-leaved mock privetPhillyrea angustifolia
- California privetLigustrum ovalifolium
- Green Olive TreePhillyrea latifolia
Tips generated and checked by Viridia — adapt them to your local climate.