Russian Olive vs Red Alder - TreeTime.ca

Russian Olive vs Red Alder

Alnus rubra

Elaeagnus angustifolia

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Red Alder
Russian Olive

Red Alder is a fast-growing deciduous tree native to western North America. Through its nitrogen-fixing roots and nitrogen-rich leaf litter, Red Alder improves soil fertility and supports the growth of surrounding plants. This makes it especially valuable on disturbed sites following logging, construction, or fire. A classic pioneer species, it often colonizes bare ground and enhances conditions for longer-lived conifers to follow.

Red Alder stabilizes soils on streambanks and disturbed slopes, reducing erosion and aiding restoration. It also supports wildlife: birds and small mammals eat the seeds and buds, deer and elk browse the foliage, and bees are drawn to the pollen-rich catkins in spring.

Red Alder also has commercial importance, with its strong yet workable wood widely used for furniture, cabinetry, veneer, and pulp. The tree takes its name from the rusty-red color the bark turns when cut or bruised.

Russian Olive is a medium-sized deciduous tree that has attractive silvery coloured foliage with small yellow flowers that emit a fragrant sweet smell.

It is drought and salt tolerant, and works well as a shelterbelt species. Russian Olive can also be used to combat erosion.

Note: although Russian Olive is planted as an attractive boulevard tree in many northern areas, in warmer areas it can invade watersheds and is considered invasive. Please do some research and plant the right tree in the right place.

Red Alder Quick Facts

Russian Olive Quick Facts

Zone: 5b
Zone: 2a
Height: 15 m (50 ft)
Height: 9 m (30 ft)
Spread: 9 m (30 ft)
Spread: 5 m (15 ft)
Light: partial shade, full sun
Light: full sun
Moisture: normal, wet
Moisture: dry, normal
Growth rate: fast
Growth rate: medium
Life span: medium
Life span: medium
Growth form: upright, rounded to conical
Spreading: seeds - medium, stump sprouting - medium
Suckering: none


Foliage: silver scales
Bark: smooth, grey
Flowers: yellow
Fruit: silver-yellow, olive-like
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: no


In row spacing: 1.8 - 2.4 m (6 - 8 ft)
Between row spacing: 5 m (16 ft)
Native to: BC
Other Names: oregon alder, pacific coast alder, western alder
Other Names: silver berry oleaster, wild olive