Skip to main content
A picture of a Grey Alder

Grey Alder

Alnus incana

Also known as

American Black Alder, Common Black Alder, Hoary-Leaved Alder, Speckled Alder, Hoary Alder

Full Sun
Moderate watering
Frost Hardy

H7

RHS hardiness

-20°C

Minimum temperature

Expected size

Height
Spread

20m

Max

10m

12m

Min

8m

50 years to reach maturity

Flowering

  • spring
  • summer
  • autumn
  • winter

More images of Grey Alder

Alnus incana ssp. rugosa — leaves.
A photo of Grey Alder

Grey Alder Overview

A fast-growing, tall, deciduous upright tree which will produce catkins and has a smooth, dark grey bark. The ovate, toothed leaves are dark and glossy green above, paler green below.

Common problems with Grey Alder

How to propagate Grey Alder

Seed

By seed.

Cuttings

Hardwood cuttings.

Other uses of Grey Alder

Often used in land reclamation in areas of dry and poor soil, such as old spoil heaps where it fixes nitrogen and consolidates the soil. Planted as windbreaks, hedging and useful for screening. An early source of pollen for bees and the 'cones' provide food for the birds.