Water Arum vs Hardstem Bulrush - TreeTime.ca

Water Arum vs Hardstem Bulrush

Calla palustris

Schoenoplectus acutus

CUSTOM GROW

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Water Arum
Hardstem Bulrush

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.

Hardstem Bulrush is a tall, native perennial wetland plant that thrives in shallow water and saturated soils, often forming extensive stands in wetland and shoreline habitats. Well suited to riparian restoration, bank stabilization, shoreline protection, and naturalization projects, it spreads through underground rhizomes to form dense colonies.

Hardstem Bulrush’s tall growth provides valuable cover and nesting habitat for waterfowl, songbirds, and small mammals, while its late-summer seeds provide food for waterfowl and other birds.

Water Arum Quick Facts

Hardstem Bulrush Quick Facts

Zone: 1b
Zone: 2a
Height: 0.2 m (0.8 ft)
Height: 1.8 m (6 ft)
Spread: 0.2 m (0.8 ft)
Spread: 0.9 m (3 ft)
Light: shade, partial shade
Light: full sun
Moisture: wet
Moisture: wet
Growth rate: medium
Growth rate: fast
Life span: short
Life span: short
Growth form: colony-forming
Growth form: upright, colony forming
Spreading: rhizomes - medium, seeds - low
Spreading: rhizomes - high

Toxicity: toxic if ingested

Flowers: white sheath around and yellow spike
Bloom time: spring to summer
Berries: red, in clusters
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, PE
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, PE
Other Names: bog arum, swamp lily, wild calla, wild dragon
Other Names: hard-stem bulrush