Woody > Alnus > Alnus rubra > Alnus rubra
Alnus rubra
Red Alder
Origin: Canada, United States (Alaska to California, coastal areas)
| Family |
| Betulaceae |
| Genus |
| Alnus |
| Species |
| rubra |
| Category |
| Woody |
| Type |
| Tree (deciduous) |
| Pronunciation |
| USDA Hardiness Zone |
| 6 |
| Canadian Hardiness Zone |
| 5 - 6a |
| RHS Hardiness Zone |
| H7 - H6 |
| Temperature (°C) |
| (-23) - (-18) |
| Temperature (°F) |
| (-10) - 0 |
| Height |
| 30 m |
Photographs
Cultivars
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Description and Growing Information
Flowering Period
| General Description |
| This tree has been placed on the IUCN Red List as least concern. |
| Cultivation |
| Very tolerant of infertile or wet sites. |
| Shape |
| Pyramidal tree with slender crown. |
| Growth |
| Medium |
| Bark/Stem Description |
| Shoots are angled and sticky, appearing first as a dark red. |
| Flower/Leaf Bud Description |
| Bus are red with glandular-resinous scales. |
| Leaf Description |
| Leaves are 8-17 x 5-11 cm, occasionally up to 20 cm, with dark green colouring above, and grey or blue-grey beneath with red-brown pubescence. |
| Flower Description |
| Male catkins 10-15 cm, slender, appearing in clusters of 3-5. |
| Fruit Description |
| Fruit catkins to 3 cm, barrel-shaped, in clusters of 3-6 on orange-red pedicels. |
| Notable Specimens |
| Wakehurst Place, Ardingly, Haywards Heath, Sussex, England. |
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