Seaside alder is a fast-growing native tree. It stays short enough to be used under utility lines, but may be difficult to locate in local nurseries.
All Common Names:
Tree or Plant Type:
- Deciduous (seasonally loses leaves)
- North America
- Residential and parks,
- City parkway,
- Wide median,
- Under utility lines
- Medium tree (25-40 feet),
- Small tree (15-25 feet)
- Full sun (6 hrs direct light daily),
- Partial sun/shade (4-6 hrs light daily)
- Zone 4,
- Zone 5 (Chicago),
- Zone 6,
- Zone 7
- Moist, well-drained soil,
- Wet soil
- Moderately Tolerant
- Intolerant of pollution,
- May be difficult to find in nurseries
- Fall color,
- Persistent fruit/seeds
Season of Interest:
- Early fall
Flower Color & Fragrance:
Shape or Form:
- Nesting birds
Tree & Plant Care
This species is best in moist to wet sites and is able to tolerate short-term flooding.
Disease, pests, and problems
Potential problems include cankers, alder aphids, and leaf miners.
Native geographic location and habitat
Native to the United States. Generally found in wet locations.
Bark color and texture
Bark is light brown to reddish brown and may be mottled.
Leaf or needle arrangement, size, shape, and texture
Simple, alternate leaves are oblong to egg-shaped with finely toothed margins. Leaves are dark green in summer, changing to yellow-brown in fall.
Flower arrangement, shape, and size
Male and female flowers on the same tree but in separate structures (monoecious). Male catkins flower in fall.
Fruit, cone, nut, and seed descriptions
Fruit are cone-like structures.