Water Arum vs Blue Flax - TreeTime.ca

Water Arum vs Blue Flax

Calla palustris

Linum lewisii

CUSTOM GROW

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Water Arum
Blue Flax

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.

Blue Flax is a native perennial wildflower known for its blue to violet flowers. Each flower lasts just a single day, but new blooms appear continuously, providing weeks of colour. This extended flowering period provides a reliable display from late spring into summer and attracts a variety of pollinators.

They can self-seed readily, so removing spent blooms helps manage their spread. Birds feed on the seeds, and when cooked, they are edible and are described as having a mild, nutty flavour. The plant grows in loose clumps with slender stems and fine foliage. Young plants are leafy, but as they mature, most leaves are shed.

Blue Flax grows well in a wide range of soils, including poor or sandy conditions, and is drought-tolerant once established. The deep root system helps to stabilize soil and prevent erosion. They are well-suited for pollinator gardens, restoration, naturalization, and xeriscaping projects.

As a perennial, it dies back to the crown each winter, it will regrow from the base in the spring. Avoid disturbing the crown during late winter to ensure healthy growth the following season.

Water Arum Quick Facts

Blue Flax Quick Facts

Zone: 1b
Zone: 3a
Height: 0.2 m (0.8 ft)
Height: 0.6 m (2.0 ft)
Spread: 0.2 m (0.8 ft)
Spread: 0.3 m (1.0 ft)
Light: shade, partial shade
Light: partial shade, full sun
Moisture: wet
Moisture: dry, normal
Growth rate: medium
Growth rate: fast
Life span: short
Life span: short
Growth form: colony-forming
Growth form: upright, rounded, clump-forming
Spreading: rhizomes - medium, seeds - low
Spreading: seeds - high
Maintenance: medium

Toxicity: toxic if ingested

Toxicity: toxic to some animals, raw seed toxic
Flowers: white sheath around and yellow spike
Flowers: pale to deep blue-violet
Bloom time: spring to summer
Bloom time: late spring to mid 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, YT, NT, NU
Other Names: bog arum, swamp lily, wild calla, wild dragon
Other Names: lewis flax, lewis wild blue flax, prairie flax, wild blue flax