Seaside Alder (Alnus maritima)

Common names:
Give a thumbs up Seaside Alder
Give a thumbs up Beach Alder

General Plant Information (Edit)
Plant Habit: Shrub
Tree
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: In Water
Wet
Wet Mesic
Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 7b
Plant Height: 10 to 30 feet
Plant Spread: 10 to 30 feet
Leaves: Deciduous
Flowers: Other: a little bit showy
Flower Color: Yellow
Uses: Windbreak or Hedge
Erosion control
Will Naturalize
Dynamic Accumulator: Nitrogen fixer
Wildlife Attractant: Birds
Other Beneficial Insects
Resistances: Flood Resistant
Salt tolerant
Pollinators: Wind
Miscellaneous: Tolerates poor soil
Monoecious
Conservation status: Vulnerable (VU)

Conservation status:
Conservation status: Vulnerable
full-grown shrub in summer

Photo gallery:

Comments:
Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Nov 24, 2017 11:30 AM

The Seaside Alder is a shrubby small tree or large shrub that grows in the wild in swamps, bottomlands, and along watercourses. It is found in the wild only in three areas: the variety of A, maritima maritima is found in spots in the Delmarva Penninsula; the A. maritima georgiensis is found in northwest Georgia, and the variety of A. maritima oklahomensis is found in two areas of Oklahoma. This species must have had a larger native range in times past, covering over all three recent areas. The glossy leaves are 2.5 to 4 inches long x 1.5 to 2 inches wide. The strobiles are about 1/2 inch long. It can grow in shallow standing water, but also tolerate dry, infertile soils. It is easy to grow from seed. There is a cultivar called "September Sun' that was developed at Iowa State University in Ames, Iowa from the Oklahoma variety from the Blue River area that has a more regular form.

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