Speckled Alder (Alnus incana subsp. rugosa)

Common names:
Give a thumbs up Speckled Alder
Give a thumbs up Tag Alder

General Plant Information (Edit)
Plant Habit: Shrub
Tree
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Wet
Wet Mesic
Soil pH Preferences: Very strongly acid (4.5 – 5.0)
Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 2 -45.6 °C (-50 °F) to -42.8 °C (-45°F)
Maximum recommended zone: Zone 6b
Plant Height: usually 15 to 25 feet, to 60 feet
Plant Spread: usually 15 to 20 feet
Leaves: Deciduous
Fruit: Other: winged nutlet in a brown woody strobile
Fruiting Time: Late summer or early fall
Fall
Late fall or early winter
Winter
Flowers: Inconspicuous
Flower Color: Russet
Flower Time: Spring
Uses: Windbreak or Hedge
Erosion control
Dynamic Accumulator: Nitrogen fixer
Wildlife Attractant: Birds
Resistances: Flood Resistant
Propagation: Seeds: Suitable for wintersowing
Pollinators: Wind
Miscellaneous: Tolerates poor soil
Monoecious
Conservation status: Least Concern (LC)

Conservation status:
Conservation status: Least Concern
Leafing out in the spring

Photo gallery:

Comments:
Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Aug 28, 2018 3:27 PM

Speckled Alder is most easily recognized by its whitish lenticels (spots) on its stems. Its leaves of 2 to 4.5 inches long have irregular serrated teeth on the margins. It is usually larger than its very similar sister species of the Smooth or Tag Alder (A. serrulata) that has leaf margins with fine, regular teeth. The Speckled Alder has a large native range over most of Canada, all New England, New York, northern Pennsylvania, a bit in West Virginia and northeast Ohio, north and west Michigan, northeast Illinois, all Wisconsin, and northeast Minnesota in swamps, bottomlands, and wet areas. It is fast growing of about 2.5 to 3 feet/year and is short-lived of about 30 to 40 years. It is not sold by conventional nurseries, but can be bought by some native plant nurseries. It is a fine shrub-tree to grow along bodies and courses of water and in swamps.

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