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A picture of a Red alder

Red alder

Alnus rubra

Also known as

Oregon alder

Full Sun
Moderate watering
Frost Hardy

6a

USDA zone

-23°C

Minimum temperature

Expected size

Height
Spread

26m

Max

11m

11m

Min

7m

Flowering

  • spring
  • summer
  • autumn
  • winter

Red alder Overview

A fast-growing deciduous tree with smooth, grey mottled bark, which can reach up to 30m in height. The male catkins are crimson red and the female catkins are very small and green and turn into dark brown, cone-like fruit.

Common problems with Red alder

How to propagate Red alder

Cuttings

Seed or hardwood cuttings.

Seed

Special features of Red alder

Hedge plant

Other uses of Red alder

Hedging, banks, firewood, nitrogen fixing. Indigenous Americans used the bark to camouflage their fishing nets. In traditional medicine, the bark has been used to treat skin complaints, lymphatic disorders and TB. In modern medicine, the plant has been shown to contain chemical compounds effective in the reduction of tumours. The wood is a traditional choice for smoking salmon because of its high oil content.