Alnus 
Flora Frost Alnus glutinosa
| Life span | Middle long (50 - 200 years) |
| Shape of tree | Elongate; Elliptic |
| Fruit type | Cone |
| Leaf type | Foliage leaf |
| Winter hardness | Good (USDA-zone 5, 6); Excellent (USDA-zone 1,2,3,4) |
| Inflorescence | Catkin |
| Leaf duration | Deciduous |
| soil pH requirement | Slightly acidic (pH 4,5 - 6,5) |
| Light conditions | Sunny |
| Growth rate | Normal; Fast |
| Leaf division | Simple |
| Plant, growth type | Erect |
| Flower sex (distribution) | Monoecious (flowers unisexual) |
| Application / Suitable for | Avenue tree; Park tree; Street tree; Landscape; Forestryplants |
| Sensibilité au sel d'épandage | Tolerant |
| Fruit-bearing period (notable) | Winter (December, January, February) |
| Moisture requirements | Normal; Moist |
The Common Alder, scientifically known as Alnus glutinosa, is a medium to long-living tree with a life span of 50 to 200 years. This tree has an elongated and elliptic shape, adding a unique aesthetic to any landscape. The Common Alder produces cone-shaped fruits and has foliage leaves.
When it comes to withstanding winter conditions, the Common Alder has a good tolerance in USDA zones 5 and 6. However, it excels in colder regions, thriving in USDA zones 1, 2, 3, and 4. This hardiness makes it a suitable choice for a variety of climates.
The Common Alder has catkin-shaped inflorescences and is deciduous, meaning it sheds its leaves during the winter months. It prefers slightly acidic soil with a pH range of 4.5 to 6.5. This tree thrives in sunny conditions and has a normal to fast growth rate.
The leaves of the Common Alder are simple and erect in their growth type. The tree bears flowers of both male and female sexes (monoecious) on separate branches. Thanks to its versatility, the Common Alder can be utilized as an avenue tree, park tree, street tree, or in landscape and forestry plantings.
In terms of salt tolerance, the Common Alder is relatively tolerant to salt spreading. This is advantageous for areas where road salt is commonly used.
Notably, the Common Alder bears fruit during the winter months, specifically in December, January, and February. This adds visual interest and provides nourishment for wildlife during the colder season.
When it comes to moisture requirements, the Common Alder can tolerate normal to moist conditions. This adaptive trait allows it to thrive in a variety of environments, making it a versatile tree for different landscapes.
Overall, the Common Alder, with its unique features and adaptability, is an excellent choice for various plantings. Its attractive shape, cone-shaped fruits, and tolerance to different conditions make it a valuable addition to any garden or landscape.
Market availability index by month:
| Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sep. | Oct. | Nov. | Dec. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 3 | 4 | 4 | 4 |