Seaside Arrowgrass vs Cow Parsnip - TreeTime.ca

Seaside Arrowgrass vs Cow Parsnip

Triglochin maritima

Heracleum maximum

CUSTOM GROW

CUSTOM GROW

Seaside Arrowgrass
Cow Parsnip

Seaside Arrowgrass is a native perennial commonly found in wetlands, salt marshes, and moist meadows. It is especially suitable for difficult growing sites. Its dense root system helps stabilize soil, while also providing food, cover, and habitat for small animals within the wetland community.

Seaside Arrowgrass is suitable for shoreline stabilization, wetland restoration, and naturalization projects.

Cow Parsnip is a native perennial wildflower known for its tall growth, very large leaves, and broad clusters of white flowers. The abundant blossoms provide nectar and pollen for a wide variety of pollinators, including bees and butterflies. Birds and small mammals feed on its seeds, while the foliage serves as a larval host for certain butterfly species.

Cow Parsnip is often among the first native perennials to establish in disturbed or open sites. It typically grows in moist meadows, along streambanks, forest edges, and roadsides. Although usually a short-lived perennial or biennial, it readily self-seeds and maintains strong populations where conditions are favorable.

Cow Parsnip is the only native Heracleum in North America and should not be confused with the highly invasive Giant Hogweed (H. mantegazzianum).

Note: The sap of the Cow Parsnip can cause phytodermatitis when exposed to ultraviolet light (sunlight). This can cause rashes or even burns. Care should be taken if pruning or handling this plant.

Seaside Arrowgrass Quick Facts

Cow Parsnip Quick Facts

Zone: 1b
Zone: 2a
Height: 0.5 m (1.5 ft)
Height: 1.8 m (6 ft)
Spread: 0.3 m (1.0 ft)
Spread: 1.2 m (4 ft)
Light: full sun
Light: partial shade, full sun
Moisture: wet
Moisture: normal, wet
Growth rate: medium
Growth rate: fast
Life span: short
Life span: short
Growth form: upright, clump-forming
Growth form: upright
Spreading: rhizomes-low, seeds-low
Spreading: seeds - low

Toxicity: can be toxic to humans and livestock

Toxicity: sap causes skin irritation
Foliage: very large, palmate leaves
Flowers: very small, pinkish-white, hair like
Flowers: large clusters of white flowers
Bloom time: spring to early summer
Bloom time: spring to early summer
Hybrid: no
Hybrid: no
Catkins: no
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: common arrowgrass, common bog arrowgrass, shore arrowgrass
Other Names: american cow parsnip, common cow parsnip