Showy Aster vs Cow Parsnip - TreeTime.ca

Showy Aster vs Cow Parsnip

Eurybia conspicua

Heracleum maximum

CUSTOM GROW

CUSTOM GROW

Showy Aster
Cow Parsnip

Showy Aster is a native perennial wildflower recognized for its tall stems topped with clusters of light purple blooms. Blooming from late summer into autumn, it provides an important late-season source of nectar and pollen for pollinators. It also produces seeds that are eaten by birds, extending its value to wildlife beyond the flowering season.

Drought tolerant once established, Showy Aster grows well in urban, rural, and disturbed sites. With its mix of ecological value and ornamental appeal, it is ideal for pollinator gardens, naturalization projects, and ecological restoration.

Cow Parsnip is a native perennial plant that grows tall with very large leaves and broad clusters of white flowers. It grows quickly, providing quick cover in disturbed areas.
Its flowers are large and plentiful, providing nectar and pollen for bees, flies, and butterflies. Its seeds are eaten by birds and small mammals. The young shoots of the plant are edible, but care must be taken as the sap of this plant can cause skin irritation (see below).
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.

Showy Aster Quick Facts

Cow Parsnip Quick Facts

Zone: 2b
Zone: 2a
Height: 0.6 m (2.0 ft)
Height: 1.8 m (6 ft)
Spread: 0.5 m (1.5 ft)
Spread: 1.2 m (4 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: any
Moisture: normal, wet
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright, colony-forming
Growth form: upright
Spreading: rhizomes - medium, seeds - medium
Spreading: seeds - low


Toxicity: sap causes skin irritation
Foliage: very large, palmate leaves
Flowers: purple-blue, with yellow centers
Flowers: large clusters of white flowers
Bloom time: late summer to early fall
Bloom time: spring to early summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


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