Twinflower vs Cow Parsnip - TreeTime.ca

Twinflower vs Cow Parsnip

Heracleum maximum

Linnaea borealis

CUSTOM GROW

CUSTOM GROW

Cow Parsnip
Twinflower

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.

Twinflower is a native, trailing evergreen ground cover known for its delicate flowers that grow in nodding pairs. These pale pink blooms are described as being sweetly fragrant, attracting native bees and other pollinators.

Growing in cool, moist, acidic soils, the trailing stems form roots as they spread and start to form mats across the forest floor. Due to its woody stem, it is technically classified as a shrub and often referred to as a subshrub or dwarf shrub. This species is well-suited for naturalization, restoration, and conservation projects.

Twinflower (Linneae borealis) was named in honour of Carl Linnaeus, who adopted it as his personal emblem.

Cow Parsnip Quick Facts

Twinflower Quick Facts

Zone: 2a
Zone: 2a
Height: 1.8 m (6 ft)
Height: 0.1 m (0.4 ft)
Spread: 1.2 m (4 ft)
Spread: 0.9 m (3 ft)
Light: partial shade, full sun
Light: any
Moisture: normal, wet
Moisture: normal, wet
Growth rate: fast
Growth rate: slow
Life span: short
Life span: short
Growth form: upright
Growth form: creeping or trailing, ground cover
Spreading: seeds - low
Spreading: stolons - medium, seeds - low

Toxicity: sap causes skin irritation

Foliage: very large, palmate leaves
Fall colour: reddish tinge
Flowers: large clusters of white flowers
Flowers: Pink, bell-shaped, fragrant pairs
Bloom time: spring to early summer
Bloom time: summer
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, NU, PE
Other Names: american cow parsnip, common cow parsnip
Other Names: northern twinflower, pink bells