Panicle Hydrangea vs Cow Parsnip - TreeTime.ca

Panicle Hydrangea vs Cow Parsnip

Heracleum maximum

Hydrangea paniculata

CUSTOM GROW

CUSTOM GROW

Cow Parsnip
Panicle Hydrangea

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.

Panicle Hydrangea is a large, broad-leaf, deciduous shrub that is prized for its ornamental appeal. It is easy to care for, long-lived, and cold-hardy.

Depending on the variety, its flowers change color throughout the blooming period. Make sure you water Panicle Hydrangeas regularly to achieve the most notable color change.

Cow Parsnip Quick Facts

Panicle Hydrangea Quick Facts

Zone: 2a
Zone: 3a
Height: 1.8 m (6 ft)
Height: 6 m (20 ft)
Spread: 1.2 m (4 ft)
Spread: 3 m (10 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: normal
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright
Spreading: seeds - low
Suckering: medium

Toxicity: sap causes skin irritation

Foliage: very large, palmate leaves
Flowers: large clusters of white flowers
Flowers: white, strong scent, very showy
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, PE
Other Names: american cow parsnip, common cow parsnip
Other Names: white panicle hydrangea