Fireweed vs Cow Parsnip - TreeTime.ca

Fireweed vs Cow Parsnip

Chamaenerion angustifolium (Epilobium angustifolium)

Heracleum maximum

CUSTOM GROW

CUSTOM GROW

Fireweed
Cow Parsnip

Fireweed is a native perennial wildflower known for its tall spikes of bright pink to purple blooms. Its long-lasting summer flowers are an important nectar source for pollinators such as bees, butterflies, and hummingbirds, while its seeds provide food for birds. Its showy, long-lasting display makes it visually striking in naturalized plantings.

Fireweed gets its namesake because it is often one of the first species to return after wildfires, supporting ecosystem recovery. Its wind-dispersed seeds allow it to spread readily, making it highly effective in large-scale restoration, revegetation, and naturalization projects.
Fireweed is the Provincial Flower of the Yukon.

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.

Fireweed Quick Facts

Cow Parsnip Quick Facts

Zone: 1a
Zone: 2a
Height: 1.2 m (4 ft)
Height: 1.8 m (6 ft)
Spread: 0.6 m (2.0 ft)
Spread: 1.2 m (4 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: normal, wet
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright, dense, colony-forming
Growth form: upright
Spreading: seeds - high, rhizomes - high
Spreading: seeds - low
Maintenance: medium


Toxicity: sap causes skin irritation
Foliage: very large, palmate leaves
Flowers: pink-purple spikes
Flowers: large clusters of white flowers
Bloom time: mid summer to fall
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: fire weed, great willowherb, rosebay willowherb, willow herb
Other Names: american cow parsnip, common cow parsnip