Buttonbush vs Cow Parsnip - TreeTime.ca

Buttonbush vs Cow Parsnip

Cephalanthus occidentalis

Heracleum maximum

CUSTOM GROW

CUSTOM GROW

Buttonbush
Cow Parsnip

Buttonbush is a moisture loving shrub that provides year round interest.

It has round, fragrant flowers resembling small buttons or pincushions. The flowers transform into small reddish-brown fruit that persists into winter while the leaves take on shades of red in fall.

Providing essential food to bees, butterflies, and other insects, this shrub is versatile. Try it in your next shrub border.

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.

Buttonbush Quick Facts

Cow Parsnip Quick Facts

Zone: 4a
Zone: 2a
Height: 2.4 m (8 ft)
Height: 1.8 m (6 ft)
Spread: 1.5 m (5 ft)
Spread: 1.2 m (4 ft)
Light: any
Light: partial shade, full sun
Moisture: normal, wet
Moisture: normal, wet
Growth rate: medium
Growth rate: fast
Life span: long
Life span: short
Growth form: upright
Spreading: seeds - low
Suckering: low
Maintenance: medium


Toxicity: sap causes skin irritation
Foliage: very large, palmate leaves
Flowers: large, white, spherical
Flowers: large clusters of white flowers
Bloom time: spring to early summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: ON, QC, NS, NB
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, PE
Other Names: american cow parsnip, common cow parsnip