Alnus rubra – Red alder, Oregon alder

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Betulaceae

Alnus rubra – Red alder, Oregon alder

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Average-sized tree, sometimes mature specimen of more than 20 m can be found. Little used species with a straight, grey trunk and strongly branching out. It is a strong grower with an open crown. The leaf is similar to A. incana, but has 8 to 14 pairs of veins. It is also bigger than that of A. incana, being 10 - 15 cm long and 12 cm across. A striking feature is that the leaf margin is slightly curved inwards. The topside of the leaf is glossy dark green, the underside is bluish-green. The catkins appear as soon as the end of January, they are 15 cm long and purple red. The strobiles appear as soon as the end of summer and decorate the tree into winter. The soil requirements are few, although surfacing is less well tolerated.

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Specifications
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Height
10 - 20 (25) m
Crown
wide conical, half-open crown
Bark and branches
grey, smooth, later slightly fissured, twigs brown grey
Leaf
ovoid, dark green, 4 - 10 cm
Flowers
catkins, ♂ and X, purple red , circa 15 cm, January/February
Fruits
strobiles
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
few requirements, will thrive in dry soils
Soil moisture
suitable for dry soil, withstand short flood, withstand long flood
Paving
tolerates partial paving
Winter hardiness zone
6 (-23,3 to -17,8 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind, resistant to de-icing salt
Application
coastal areas
Shape
clearstem tree
Origin
western North America
Synonyms
Alnus oregona
Clear stem tree clay soil loamy soil nutrient-poor soil sandy soil tolerates partial paving resistant to de-icing salt resistant to frost (WH 1 - 6) suitable for dry soil withstand long flood withstand short flood can withstand wind broad conical 1st size , taller than 12 metres half-open crown green orange/red January average growing Conspicuous bloom non-toxic (usually) Ornamental fruit
Frequently asked questions
Alnus rubra

Alnus rubra can eventually reach a height of 10 - 20 (25) m, depending on the site and climate conditions.

Alnus rubra is average growing and can eventually reach a height of 10 - 20 (25) m, depending on the site and climate conditions.

The right time to plant Alnus rubra is during the dormancy period. In Western Europe, Alnus rubra with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Alnus rubra blooms in january.
General