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River Alder vs Green Alder

Alnus incana

Alnus crispa

River Alder
Green Alder

River Alder is a large shrub or small tree with a multi-stemmed, spreading habit. A shrub native to the boreal forests across North America, River Alder is an excellent tree for soil stabilization near rivers and creeks.

This tree is recognizable by its small brown seed cones and smooth, silver-grey bark with white horizontal lenticels. Unlike Green Alder, River Alder's seed pods are long and hang off short branches.

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

Green Alder is a cold hardy, native shrub. It is often planted on infertile sites so it can fix nitrogen from the air and improve the soil.

Green Alder is known for its smooth grey bark and attractive shiny green leaves; it is commonly used in reclamation.

RIVER ALDER QUICK FACTS

GREEN ALDER QUICK FACTS

Zone: 1a
Zone: 1a
Height: 8 m (25 ft)
Height: 7 m (23 ft)
Spread: 4 m (12 ft)
Spread: 3 m (10 ft)
Moisture: normal, wet
Moisture: any
Light: full sun
Light: any
Fuzz/fluff: yes
Fuzz/fluff: yes
Catkins: yes
Catkins: yes
Fall colour: yellow to orange
Fall colour: yellow
Growth rate: fast
Growth rate: fast
Life span: short
Life span: 50 years
Maintenance: low
Suckering: none
Suckering: high
Pollution tolerance: medium
Pollution tolerance: medium


In row spacing: 0.9 m (3 ft)
Between row spacing: 5 m (16 ft)





Ships To Canada: yes
Ships to USA: no
Ships To Canada: yes
Ships to USA: no