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Flax seed - Blue Annual Flax : Pale blue flowers atop reedy stems.

Flax - Blue Annual Flax

Linum usitatissimum

Pale blue flowers atop reedy stems are often grown commercially for fiber or seed. Best seeded in early spring. Prefers cool moist growing conditions followed by a dry late summer. Easy-to-grow in full sun. Hardy to zone 4. Self-seeding annual.  

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Average Seed / oz Seed / 100' Row Average Yield / 100' Row Days to Harvest
20000 n/a n/a 120-140
Planting Season Ideal Soil Temp Sun Frost Tolerance
After Last Frost 65-80°F Full Sun Frost Sensitive
Sowing Method Seed Depth Direct Seed Spacing Seeds Per Packet
Direct Seed 1/8" 4-8" 80
Mature Spacing Days to Sprout Production Cycle Seed Viability
4-6" 20-25 Annual 2 years

Site Selection

Flax is a frost-sensitive annual that prefers full sun and fertile, well-drained soil. Flax thrives in cool, moist growing conditions.


Flax can be direct seeded outdoors in spring as soon as the soil can be worked. Optimal soil temperatures for germination are 65-80°F. Sow seeds 1/8" deep. Seeds will germinate in 20-25 days. Thin seedlings so mature plants are 4-6" apart. Flax readily self-seeds year after year.


If growing for fiber, harvest flax stems before seeds fully mature (120-140 days). Allow some plants to set seed to ensure flax plants the following year.

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