Blue Boy Clematis vs Blue Flax - TreeTime.ca

Blue Boy Clematis vs Blue Flax

Clematis integrifolia Blue Boy

Linum lewisii

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Blue Boy Clematis
Blue Flax

Blue Boy Clematis is a cold-hardy, fast growing, woody climbing vine. Hundreds of stunning steel-blue bell shaped flowers adorn the vine throughout the summer that droop and appear to hang in the air. The fibrous stems spread and create a fan-like symmetry shape.

This species will do best with support from a trellis, fence, or even other shrubs or tree stumps.

The Blue Boy Clematis was developed in Manitoba, Canada in 1947 by famous breeder Frank L. Skinner by crossing C. integrifolia x C. viticella, but it didn’t gain popularity until the 1990’s.

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.

Blue Boy Clematis Quick Facts

Blue Flax Quick Facts

Zone: 2b
Zone: 3a
Height: 3 m (10 ft)
Height: 0.6 m (2.0 ft)
Spread: 0.6 m (2.0 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: medium
Growth rate: fast
Life span: medium
Life span: short
Growth form: upright, rounded, clump-forming
Spreading: seeds - high
Suckering: medium
Maintenance: medium


Toxicity: toxic to some animals, raw seed toxic
Flowers: steel blue
Flowers: pale to deep blue-violet
Bloom time: late spring to mid summer
Hybrid: yes
Hybrid: no
Catkins: no
Catkins: no


Other Names: lewis flax, lewis wild blue flax, prairie flax, wild blue flax