Key features
Final size20m x 8m in 20 years
FoliageGreen leaves (deciduous)
SoilWet-tolerant
Description
Alnus incana, commonly known as Grey Alder, is a conical deciduous tree that typically grows up to 20m in height with an 8m spread. In late winter to early spring, it showcases clusters of 3 to 4 yellow-brown male catkins before its leaves emerge. The tree produces ovoid fruits in summer, adding seasonal interest. Hardy and adaptable, Grey Alder thrives in all soil types and prefers a position in full sun, making it a versatile choice for a variety of landscapes.
AKA: Grey alder, American black alder, common black alder, gray alder, hoary-leaved alder, speckled alder
Planting Steps
1Preparation
- Pot-grown plants can be planted at any time of year, whereas bare roots need to be planted between November and March.
- Clear weeds and grass within a metre of the planting hole.
- Dig a hole as deep as the root mass and twice as wide.
- To help your plant establish more effectively, sprinkle Rootgrow in the hole.
2Planting
- Gently loosen the roots and place into the planting hole.
- Ensure the top of the plant’s compost is flush with the level of the surrounding soil and the graft union or collar of the tree is above ground level.
- Mix 50% of the original soil with 50% compost.
- Fill in the hole, firming the soil gently.
3Last Steps
- Water generously around the base of the plant.
- If you are planting either a single stem tree or mature standard tree, we recommend adding a staking kit and rabbit guard.
Aftercare Advice
Trees and shrubs require a good watering regime for a couple of years whilst they establish. Water well and regularly through spring and summer, increasing in hot or dry weather. If planting in autumn, you may only need to water a little. It is advisable to keep the area free of competing weeds and grass during this period.
For more detailed advice and video guides, please visit our Help & Advice section.
