Ninebark vs Sitka Alder - TreeTime.ca

Ninebark vs Sitka Alder

Physocarpus opulifolius

Alnus alnobetula subsp. sinuata

CUSTOM GROW

CUSTOM GROW

Ninebark
Sitka Alder

Ninebark is a small, multi-stemmed shrub, that is used to add texture or colour to any yard.

It features flaky, cinnamon-brown bark, attractive white flowers, and long, maple-like leaves.

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.

Ninebark Quick Facts

Sitka Alder Quick Facts

Zone: 2a
Zone: 2a
Height: 2.1 m (7 ft)
Height: 5 m (15 ft)
Spread: 2.1 m (7 ft)
Spread: 3 m (10 ft)
Light: full sun
Light: partial shade, full sun
Moisture: dry, normal
Moisture: wet
Growth rate: slow
Growth rate: medium
Life span: long
Life span: medium
Growth form: upright to prostrate, thicket-forming
Spreading: seed - medium, layering - medium
Suckering: none


Bark: redish-brown to grey, smooth
Flowers: small white clusters
Berries: small pink to purple berry like follicles
Hybrid: no
Hybrid: no
Catkins: no
Catkins: yes


Native to: ON, QC, NS, NB
Native to: AB, BC, YT, NT
Other Names: wavy leaf alder