Linum usitatissimum (Common Flax) is one of the oldest domesticated crops, cultivated for over 5,000 years for its fiber, edible seeds, and linseed oil. Seeds germinate rapidly without special pre-treatment and are highly amenable to both indoor starting and direct sowing. The species shows excellent germination rates in temperate climates with proper moisture and temperature conditions.
Before sowing
No pre-treatment needed — sow directly.
Sowing
What to expect
Tips
Sow seeds shallowly (3mm-5mm depth only, barely covering). Best sown in situ or started indoors 4-6 weeks before last frost. Maintain consistently moist but not waterlogged soil. Use a fine seedbed to prevent soil crusting that blocks germination. Germination occurs faster at warmer temperatures (optimum 22°C). Light does not affect germination. Thin seedlings to 10-15cm apart. Flax dislikes clay soils and prefers well-drained, fertile loam. No seed treatment necessary but fungicide treatment recommended for commercial production.
Sources: North Carolina State University Extension, Wisconsin Extension, USDA sources, horticultural seed guides
