Black-Eyed Susan vs Cow Parsnip - TreeTime.ca

Black-Eyed Susan vs Cow Parsnip

Rudbeckia hirta

Heracleum maximum

NOT AVAILABLE THIS SEASON - MIGHT RETURN

CUSTOM GROW

Black-Eyed Susan
Cow Parsnip

Black-Eyed Susan is a striking native wildflower known for its bright yellow, daisy-like flowers with dark center disks. With deadheading, the plant can bloom for an extended period, from mid-summer to early fall. These cheerful flowers attract a variety of pollinators, including bees and butterflies. Adding to its ecological value, the plant also acts as a host for the Wavy-Lined Emerald Moth (Synchlora aerata) and the Silvery Checkerspot (Chlosyne nycteis) butterfly.

While it is typically a short-lived perennial or biennial, the plant freely self-seeds. This allows it to persist in the landscape, particularly in natural areas where it can spread and establish itself. This plant is drought-tolerant, salt-tolerant, and deer and rabbit-resistant, making it ideal for challenging environments. The Black-Eyed Susan is well suited to wildflower gardens, pollinator gardens, as well as slopes, banks, and naturalized areas

As a perennial, it dies back to the crown each winter, it will regrow from the base in the spring. Avoid disturbing the crown during late winter to ensure healthy growth the following season.

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.

Black-Eyed Susan Quick Facts

Cow Parsnip Quick Facts

Zone: 3a
Zone: 2a
Height: 0.8 m (2.5 ft)
Height: 1.8 m (6 ft)
Spread: 0.5 m (1.5 ft)
Spread: 1.2 m (4 ft)
Light: full sun
Light: partial shade, full sun
Moisture: dry, normal
Moisture: normal, wet
Growth rate: very fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright
Spreading: seeds - low
Suckering: none
Maintenance: medium


Toxicity: sap causes skin irritation
Foliage: very large, palmate leaves
Flowers: bright yellow; daisy-like
Flowers: large clusters of white flowers
Bloom time: early summer to fall
Bloom time: spring to early summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


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