Aspen
Populus tremula · Salicaceae
📷 Øyvind Holmstad · CC BY-SA 4.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around aspen and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- March to April
- Adult size
- Up to 20 m in height
- Growth
- Very fast
- Hardiness
- Very hardy (down to -40 °C)
- Origin
- Europe, temperate Asia
- Soil type
- Fresh to moist, well-drained soil
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Quaking aspen grows very fast and loves moist soils. Plant in autumn or spring.
The common mistake
Don't plant too close to a house or drain: the roots are super invasive and can cause serious damage.
The pro's trick
Use a root barrier (heavy-duty geotextile) if you're planting it near a terrace edge or pipes to keep those roots in check.
Care
Sunlight
The aspen thrives in full sun, which encourages its vigorous growth and optimal development. It also tolerates partial shade, but direct light maximizes its vitality. Plant it in an open location, away from obstacles that could hinder its growth.
Watering
Water regularly during the active growing period, particularly in the first two years after planting. The aspen appreciates fresh to moist soils: maintain consistent moisture without creating waterlogging. In dry climates, increase watering frequency.
Soil
Choose rich, well-drained soil that is slightly acidic to neutral. The aspen adapts to different soil types but prefers fresh, well-structured terrain. Amend the soil at planting time with compost or potting soil to encourage rooting.
Pruning and training
Pruning is not essential thanks to this tree's naturally balanced form. You can nevertheless remove dead, crossing, or poorly oriented branches in late winter. Avoid severe pruning, which weakens the tree.
Fertiliser
Apply balanced fertiliser in spring during the first three years to support growth. After that, an annual application of well-decomposed compost is quite sufficient. Excess nitrogen promotes foliage at the expense of the tree's structure.
Pests and diseases
The aspen is generally robust. Watch for rust attacks in spring and fungal infections in humid weather. Good drainage and adequate air circulation prevent most problems. Remove affected branches quickly.
Did you know?
The aspen gets its common name from its remarkably mobile leaves: thanks to a flattened and highly flexible leaf stalk, they tremble and quiver at the slightest breeze, even one imperceptible to us. This unique characteristic has inspired poets and artists throughout the centuries. In ancient times, the Celts associated this tree with courage and spiritual protection.
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
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- Creeping willowSalix repens
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Tips generated and checked by Viridia — adapt them to your local climate.