Round-Leaved Sundew vs Cow Parsnip - TreeTime.ca

Round-Leaved Sundew vs Cow Parsnip

Heracleum maximum

Drosera rotundifolia

CUSTOM GROW

CUSTOM GROW

Cow Parsnip
Round-Leaved Sundew

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.

Round-Leaved Sundew is a native carnivorous plant, easily recognized by its bright green leaves covered in distinctive red, glandular hairs. These hairs secrete a sticky substance that is used to attract, trap, and digest insects. Their carnivorous nature allows them to survive in nutrient-poor, acidic soils where many other plants may struggle to grow.
They produce small white flowers that grow along the top of a slender, leafless stem. They can be found growing in wetlands, most often among sphagnum moss, in consistently moist, acidic soils. It does best in cooler summer climates and is intolerant of shade. Due to its small size, the plant can be difficult to spot in its natural habitat. Round-Leaved Sundew is an indicator of healthy wetland systems and is valued in ecological restoration and conservation projects.

Cow Parsnip Quick Facts

Round-Leaved Sundew Quick Facts

Zone: 2a
Zone: 3a
Height: 1.8 m (6 ft)
Height: 0.1 m (0.2 ft)
Spread: 1.2 m (4 ft)
Spread: 0.1 m (0.4 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: wet
Growth rate: fast
Growth rate: slow
Life span: short
Life span: short
Growth form: upright
Growth form: rosette-forming
Spreading: seeds - low
Spreading: axillary bud plantlets - medium, seeds - low

Toxicity: sap causes skin irritation

Foliage: very large, palmate leaves
Foliage: round, green with sticky red tentacles
Fall colour: red to marooon
Flowers: large clusters of white flowers
Flowers: tiny white flowers on long leafless stem
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: roundleaf sundew