Grey Alder vs Water Arum - TreeTime.ca

Grey Alder vs Water Arum

Alnus incana

Calla palustris

NOT AVAILABLE THIS SEASON - MIGHT RETURN

CUSTOM GROW

Grey Alder
Water Arum

River Alder is a large shrub or small tree with a multi-stemmed, spreading habit. It is an excellent tree to plant if you want to stabilize the soil near rivers and creeks.

Unlike the other alder varieties, River Alder is attractive enough to be included in riverside plantings by municipal and provincial park organizations.

Water Arum is a native perennial wetland plant known for its showy white oval sheaths (spathe) that surround a yellow-green, cylindrical flower spike (spadix). It has large, oblong, heart-shaped leaves on stems that rise above the water from shallow, spreading rhizomes. The blossoms are followed in late summer by tiny, pear-shaped fruits that ripen to bright red, adding ornamental interest to wet habitats.

Water Arum provides food for birds and small mammals that eat its berries, and its flowers attract pollinators. It can tolerate cold climates and forms colonies in shallow water and saturated soils. It is well-suited for ecological restoration, riparian planting, naturalisation, and habitat projects in wet and shaded environments.

Grey Alder Quick Facts

Water Arum Quick Facts

Zone: 1a
Zone: 1b
Height: 8 m (25 ft)
Height: 0.2 m (0.8 ft)
Spread: 4 m (12 ft)
Spread: 0.2 m (0.8 ft)
Light: full sun
Light: shade, partial shade
Moisture: normal, wet
Moisture: wet
Growth rate: fast
Growth rate: medium
Life span: short
Life span: short
Growth form: colony-forming
Spreading: rhizomes - medium, seeds - low
Suckering: none


Toxicity: toxic if ingested
Fall colour: yellow to orange
Flowers: white sheath around and yellow spike
Bloom time: spring to summer
Fruit: small catkins
Berries: red, in clusters
Cones: small brown cones
Hybrid: no
Hybrid: no
Catkins: yes
Catkins: no


Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, NU, PE
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, PE
Other Names: hoary alder, river alder, speckled alder
Other Names: bog arum, swamp lily, wild calla, wild dragon