Swamp Rose Mallow (Hibiscus) vs Water Arum - TreeTime.ca

Swamp Rose Mallow (Hibiscus) vs Water Arum

Hibiscus moscheutos

Calla palustris

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Swamp Rose Mallow (Hibiscus)
Water Arum

Swamp Rose Mallow (Hibiscus) has large white-pink showy flowers which attract hummingbirds and pollinators to your yard. It is a tall, fast growing perennial shrub. The flowers typically only last 1-2 days, but the plant will continue to rebloom throughout the season.

This hibiscus tolerates heat and humidity but does not do well when exposed to wind. Make sure the plant has access to lots of moisture for better flowering.

The Swamp Rose Mallow (Hibiscus) is also known as the dinner plate hibiscus because it can grow incredibly large flowers, as big as dinner plates.

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.

Swamp Rose Mallow (Hibiscus) Quick Facts

Water Arum Quick Facts

Zone: 5a
Zone: 1b
Height: 1.5 m (5 ft)
Height: 0.2 m (0.8 ft)
Spread: 0.9 m (3 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: low


Toxicity: toxic if ingested
Flowers: pink-red
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: ON
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, PE
Other Names: crimson-eyed rose-mallow, dinner plate hibiscus, eastern rosemallow, hardy hibiscus, marsh mallow, marshmallow hibiscus, sea hollyhock, swamp mallow, swamp rose hibiscus
Other Names: bog arum, swamp lily, wild calla, wild dragon