Blue Flax vs Showy Milkweed - TreeTime.ca

Blue Flax vs Showy Milkweed

Linum lewisii

Asclepias speciosa

NOT AVAILABLE THIS SEASON - MIGHT RETURN

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Blue Flax
Showy Milkweed

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.

Showy Milkweed is a native perennial wildflower known for its fragrant clusters of pink to purple, star-shaped flowers. It is an essential plant for Monarch butterflies, acting as a critical host plant for caterpillars and a nectar source for adults. Blooming from early to mid-summer, these flowers also supply nectar to many other pollinators, including bees, butterflies, moths, and hummingbirds.

Ideal for butterfly conservation, pollinator gardens, and naturalization projects, Showy Milkweed thrives in a wide range of soils, including dry and rocky ground. While it spreads via underground rhizomes to form colonies, it is much less aggressive than Common Milkweed (Asclepias syriaca).

Note: All parts of the plant contain toxic cardiac glycosides, especially the milky sap. Do not ingest any part of the plant and prevent sap from contacting skin or eyes. Toxic to humans, pets, and livestock.

Blue Flax Quick Facts

Showy Milkweed Quick Facts

Zone: 3a
Zone: 3a
Height: 0.6 m (2.0 ft)
Height: 0.9 m (3 ft)
Spread: 0.3 m (1.0 ft)
Spread: 0.5 m (1.5 ft)
Light: partial shade, full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright, rounded, clump-forming
Growth form: upright, clump forming
Spreading: seeds - high
Spreading: rhizomes - high, seeds - high
Maintenance: medium
Maintenance: medium

Toxicity: toxic to some animals, raw seed toxic

Toxicity: toxic to pets, livestock, and humans if ingested, can cause skin and eye irritation.
Flowers: pale to deep blue-violet
Flowers: purplish-pink clusters
Bloom time: late spring to mid summer
Bloom time: early to mid summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC, SK, MB, ON, YT, NT, NU
Native to: AB, BC, MB, YT
Other Names: lewis flax, lewis wild blue flax, prairie flax, wild blue flax