Woody > Alnus > Alnus glutinosa > Alnus glutinosa 'Imperialis'
Alnus glutinosa
'Imperialis'
Imperial Alder
| Family |
| Betulaceae |
| Genus |
| Alnus |
| Species |
| glutinosa |
| Cultivar |
| 'Imperialis' |
| Category |
| Woody |
| Type |
| Tree (deciduous) |
| USDA Hardiness Zone |
| 3 |
| Canadian Hardiness Zone |
| 1 |
| RHS Hardiness Zone |
| H7 |
| Temperature (°C) |
| -40 - (-35) |
| Temperature (°F) |
| -40 - (-30) |
| Height |
| 20 m |
Photographs
Awards
Description and Growing Information
Flowering Period
| Cultivation |
| Tolerates infertile soil, being very lime-tolerant, as well as tolerating very wet sites, including standing water up to 30 cm deep. |
| Shape |
| A weak, open shrub. |
| Growth |
| Slow |
| Habitat |
| Horticultural origin. |
| Bark/Stem Description |
| Bark is brown-black, with thin branches. |
| Leaf Description |
| Leaves are 4-10 cm, persisting well into autumn, dark lustrous green on top, paler underneath. The 'Imperialis' cultivar has especially deeply cut narrow lobes. |
| Flower Description |
| Male catkins grow to 5-10 cm, appearing in groups of 3-5, while the female catkins grow to 1-2 cm, ovoid, in groups of 3-8. |
| Notable Specimens |
| Whistling Gardens, Wilsonville, Ontario, Canada. |
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