Sitka Alder vs Seaside Arrowgrass - TreeTime.ca

Sitka Alder vs Seaside Arrowgrass

Alnus alnobetula subsp. sinuata

Triglochin maritima

CUSTOM GROW

CUSTOM GROW

Sitka Alder
Seaside Arrowgrass

Sitka Alder is a native deciduous shrub or small tree that often forms dense thickets. Its extensive root system stabilizes slopes and streambanks. Nitrogen-fixing capabilities and nutrient-rich leaf litter improve soil fertility, creating better growing conditions for surrounding plants. These qualities make it especially effective in disturbed or erosion-prone sites.
Often found in moist, high-elevation mountain environments, Sitka Alder also enhances habitat by providing cover and structure in both riparian and upland areas. Birds and small mammals utilize it for nesting, and its seeds serve as a food source.
Note: We use Sitka Alder for Alnus alnobetula subsp. sinuata. This species is also known by many other common names, including Mountain Alder, Green Alder, and others. Please confirm the scientific name to ensure you are ordering the correct plant.

Seaside Arrowgrass is a native perennial commonly found in wetlands, salt marshes, and moist meadows. It is especially suitable for difficult growing sites. Its dense root system helps stabilize soil, while also providing food, cover, and habitat for small animals within the wetland community.

Seaside Arrowgrass is suitable for shoreline stabilization, wetland restoration, and naturalization projects.

Sitka Alder Quick Facts

Seaside Arrowgrass Quick Facts

Zone: 2a
Zone: 1b
Height: 5 m (15 ft)
Height: 0.5 m (1.5 ft)
Spread: 3 m (10 ft)
Spread: 0.3 m (1.0 ft)
Light: partial shade, full sun
Light: full sun
Moisture: wet
Moisture: wet
Growth rate: medium
Growth rate: medium
Life span: medium
Life span: short
Growth form: upright to prostrate, thicket-forming
Growth form: upright, clump-forming
Spreading: seed - medium, layering - medium
Spreading: rhizomes-low, seeds-low


Toxicity: can be toxic to humans and livestock
Bark: redish-brown to grey, smooth
Flowers: very small, pinkish-white, hair like
Bloom time: spring to early summer
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: no


Native to: AB, BC, YT, NT
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, NU, PE
Other Names: wavy leaf alder
Other Names: common arrowgrass, common bog arrowgrass, shore arrowgrass