Cow Parsnip vs Nodding Onion - TreeTime.ca

Cow Parsnip vs Nodding Onion

Heracleum maximum

Allium cernuum

CUSTOM GROW

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Cow Parsnip
Nodding Onion

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.

Nodding Onion is a native perennial wildflower known for its nodding clusters of flowers that range in color from white to pink to purple. The lightly scented blooms provide pollen and nectar for pollinators, especially bees, which can collect while hanging upside down, a capability most other insects lack.

The narrow, grass-like leaves of the Nodding Onion can be used as a seasoning in cooked dishes, though bulbs and raw leaves should not be eaten in large quantities. All parts of the plant have an onion-like aroma when bruised, which helps deter deer and rabbits. They can self-seed readily, so removing spent blooms helps manage their spread. Tolerant of a range of soils, including alkaline, it is well-suited for a variety of plantings, including pollinator gardens and naturalization projects.

Cow Parsnip Quick Facts

Nodding Onion Quick Facts

Zone: 2a
Zone: 3a
Height: 1.8 m (6 ft)
Height: 0.3 m (1.0 ft)
Spread: 1.2 m (4 ft)
Spread: 0.2 m (0.5 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: normal, wet
Moisture: dry, normal
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright
Growth form: upright to spreading, clump-forming
Spreading: seeds - low
Spreading: seeds - high
Maintenance: medium

Toxicity: sap causes skin irritation

Toxicity: raw leaves and bulbs can be midly toxic
Foliage: very large, palmate leaves
Foliage: smells of onion when crushed, edible
Flowers: large clusters of white flowers
Flowers: white, pink, or purple nodding clusters
Bloom time: spring to early summer
Bloom time: late spring to 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, ON
Other Names: american cow parsnip, common cow parsnip
Other Names: ladys leek, nodding wild onion