Alnus rubra
Red Alder









Slender, pyramidal form. Red buds reveal red-green catkins in spring. Inner bark is orange-red. Green leaves are blue-green beneath. Hardy. Tolerates moist soils. Catkins are a source of pollen for bees in early to mid-spring. Fixes nitrogen in the soil, so good for improving soil conditions for other plants.
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10 Year Size
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Taxonomy and Etymology
Family: Betulaceae, birch family, a family of mostly Northern Hemisphere deciduous trees and shrubs.
Genus: Alnus, alnus (Latin, noun), meaning 'alder'. Commonly known as alder, a genus of trees and shrubs.
Species: Alnus rubra, rubra (Latin, adjective), meaning 'red', in reference to the orange-red inner bark.
Common Name: Red Alder
Description and Features
Description: Slender, pyramidal form. Red buds reveal red-green catkins in spring. Inner bark is orange-red. Green leaves are blue-green beneath. Hardy. Tolerates moist soils. Catkins are a source of pollen for bees in early to mid-spring. Fixes nitrogen in the soil, so good for improving soil conditions for other plants.
Height: 10m
Width: 5m
Uses: Attracts bees
Tolerates: Windy
Soil Type: Clay soils, Poor draining soils
Winter Foliage: Deciduous
Origin: Exotic
Foliage:
Summer: Green
Autumn: Green
Winter: None
Spring: Green
Flowers:
Summer: None
Autumn: None
Winter: None
Spring: Red, Green
References
https://en.wikipedia.org/wiki/Alnus_rubra
https://species.wikimedia.org/wiki/Alnus_rubra
https://treesandshrubsonline.org/articles/alnus/alnus-rubra/
https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=19474
https://www.rhs.org.uk/plants/908/i-alnus-rubra-i/details
https://www.vdberk.co.uk/trees/alnus-rubra/
https://plants.ces.ncsu.edu/plants/alnus-rubra/
https://landscapeplants.oregonstate.edu/plants/alnus-rubra
https://selectree.calpoly.edu/tree-detail/153
https://www.ebben.nl/en/treeebb/alrubra-alnus-rubra
https://www.gardenia.net/plant/alnus-rubra
https://temperate.theferns.info/viewtropical.php?id=Alnus+rubra