Short answer: don't soak flax. Line a plate or tray with a damp paper towel or grow mat, sprinkle the dry seed thinly over it, and mist well. Cover loosely and mist twice a day. Harvest sprouts in 4 to 6 days, or let them grow in light as microgreens and cut at 8 to 12 days.
What are flax sprouts?
Flax (Linum usitatissimum) is the seed behind linseed and ground flax. Like chia and basil, it's a gel-forming seed: its coat turns into a thick gel in water. Sprouting.com gives flax 4 to 6 days as sprouts and 8 to 12 as microgreens.1
How to grow flax sprouts
- Day0
Prepare a surface
Line a plate or tray with a damp paper towel or a grow mat.
- Day0
Sow dry
Sprinkle the dry seed in a thin, even layer. Mist until the seed looks gel-coated.
- Day0–4
Mist
Cover loosely with a lid or plate. Mist twice a day so the gel never dries out.
- Day4–6
Harvest sprouts
Snip the sprouts above the seed layer, or let them grow on as microgreens.
Flax microgreens
For microgreens, use a tray with a thin layer of soil or a grow mat. Sow 15 to 20 g per 10 × 20 inch tray, keep it covered for 3 days, then give light. Cut at 8 to 12 days. See how to grow microgreens without soil.
Problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| One sticky clump | Soaked or grown in a jar | Sow dry on a plate or tray |
| Dry patches | Gel dried out | Mist more often, keep covered |
| Mold | Too wet, no airflow | Mist lightly, uncover for an hour daily |
Tips for growing flax on a plate
- Sow thinly. A thick layer stays wet in the middle and can spoil.
- Mist, don't pour. A spray bottle keeps the gel damp without flooding it.
- Use a clay dish or grow mat if you have one. Both hold moisture evenly.
- Give the cover a break. Lift the cover for an hour a day so air can move.
Flax vs chia sprouts
Chia and flax are both gel-forming seeds grown on a plate. Chia is a little faster and milder. Flax grows a denser mat with a nutty taste. Both work well on salads and sandwiches.
Storing and eating
Use flax sprouts fresh, within 3 to 4 days. Add them to salads, sandwiches and smoothies.
Safety
The FDA says higher-risk groups should not eat raw or lightly cooked sprouts, and Health Canada advises everyone to cook them.23 Microgreens are a lower-risk raw choice.
Flax FAQ
Can you sprout flax seeds in a jar?
Not well. Flax forms a sticky gel and clumps into a ball in a jar. Grow it on a damp plate, tray or clay dish instead.
Should I soak flax seeds before sprouting?
No. Sow them dry on a damp surface and mist them. Soaked flax turns into a thick, sticky mass.
What do flax sprouts taste like?
Mild and nutty, with a soft leafy texture once the seed leaves open.
How long do flax sprouts take?
About 4 to 6 days as sprouts and 8 to 12 days as microgreens, according to Sprouting.com.
Written by Michael
A passionate sprouting professional sharing practical tips for growing sprouts and microgreens at home. More about Michael
