Grey Alder vs Red Alder - TreeTime.ca

Grey Alder vs Red Alder

Alnus incana

Alnus rubra

NOT AVAILABLE THIS SEASON - MIGHT RETURN

CUSTOM GROW

Grey Alder
Red Alder

River Alder is a large shrub or small tree with a multi-stemmed, spreading habit. It is an excellent tree to plant if you want to stabilize the soil near rivers and creeks.

Unlike the other alder varieties, River Alder is attractive enough to be included in riverside plantings by municipal and provincial park organizations.

Red Alder is a fast-growing deciduous tree native to western North America. Its fixes nitrogen, which enriches soils and supports the growth of surrounding plants. Ideal for sites with poor soil conditions, or areas disturbed by logging, construction or fire.
It provides shade in riparian areas, creating cover for fish. Its seeds and buds are eaten by birds and small mammals, while the foliage provides browse for wildlife. The catkins release clouds of pollen attracting bees and other insects.
The Red Alder gets its namesake from the rusty-red color the bark turns when bruised.

Grey Alder Quick Facts

Red Alder Quick Facts

Zone: 1a
Zone: 5b
Height: 8 m (25 ft)
Height: 15 m (50 ft)
Spread: 4 m (12 ft)
Spread: 9 m (30 ft)
Light: full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: normal, wet
Growth rate: fast
Growth rate: fast
Life span: short
Life span: medium
Growth form: upright, rounded to conical
Spreading: seeds - medium, stump sprouting - medium
Suckering: none


Fall colour: yellow to orange
Bark: smooth, grey
Fruit: small catkins
Cones: small brown cones
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: yes


Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, NU, PE
Native to: BC
Other Names: hoary alder, river alder, speckled alder
Other Names: oregon alder, pacific coast alder, western alder