Cow Parsnip vs Blue Flax - TreeTime.ca

Cow Parsnip vs Blue Flax

Heracleum maximum

Linum lewisii

CUSTOM GROW

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Cow Parsnip
Blue Flax

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.

Blue Flax is a native perennial wildflower known for its blue to violet flowers. Each flower lasts just a single day, but new blooms appear continuously, providing weeks of colour. This extended flowering period provides a reliable display from late spring into summer and attracts a variety of pollinators.

They can self-seed readily, so removing spent blooms helps manage their spread. Birds feed on the seeds, and when cooked, they are edible and are described as having a mild, nutty flavour. The plant grows in loose clumps with slender stems and fine foliage. Young plants are leafy, but as they mature, most leaves are shed.

Blue Flax grows well in a wide range of soils, including poor or sandy conditions, and is drought-tolerant once established. The deep root system helps to stabilize soil and prevent erosion. They are well-suited for pollinator gardens, restoration, naturalization, and xeriscaping projects.

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 Quick Facts

Blue Flax Quick Facts

Zone: 2a
Zone: 3a
Height: 1.8 m (6 ft)
Height: 0.6 m (2.0 ft)
Spread: 1.2 m (4 ft)
Spread: 0.3 m (1.0 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, rounded, clump-forming
Spreading: seeds - low
Spreading: seeds - high
Maintenance: medium

Toxicity: sap causes skin irritation

Toxicity: toxic to some animals, raw seed toxic
Foliage: very large, palmate leaves
Flowers: large clusters of white flowers
Flowers: pale to deep blue-violet
Bloom time: spring to early summer
Bloom time: late spring to mid 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, MB, ON, YT, NT, NU
Other Names: american cow parsnip, common cow parsnip
Other Names: lewis flax, lewis wild blue flax, prairie flax, wild blue flax