Why Variety Choice Matters in a British Climate

Flax is a forgiving crop, but it is not indifferent to where it grows. British summers are short, cool and often damp — conditions that suit fibre flax far better than the linseed varieties bred for the Canadian prairies. Choose the wrong type and you may get a crop that lodges after a June downpour, ripens unevenly, or throws short, brittle stems that snap the moment you try to ripple them. Choose well and you get a tall, clean stand of straw that rets evenly and spins into strong, lustrous linen.

Before ordering seed, decide what you want from the patch: fibre for spinning, seed for the kitchen, or a little of both. That decision shapes everything — variety, sowing density, sowing date and the moment you pull the crop.

Fibre Flax, Linseed, or Something in Between

All three are the same species, but they have been bred in opposite directions.

• Fibre flax is selected for a single tall stem, minimal branching and a high proportion of long fibre. It is sown thickly so plants compete upwards rather than spreading sideways; expect 80–120 cm of usable straw in a good year.
• Linseed is shorter and freely branching, with large capsules and a far higher seed yield. The straw is woody, short and awkward to process — fine for compost, frustrating on a distaff.
• Dual-purpose types sit between the two. They rarely excel at either, but in a small garden they are a sensible compromise.

If your heart is set on handspun linen, grow a fibre variety and buy your porridge flax elsewhere.

Varieties Worth Trying in the UK

Fibre flax breeding has been dominated by French, Belgian and Dutch programmes, and their varieties suit our maritime climate well. Small quantities are easy to find by the gram.

• 'Ariane' — a long-standing standard: tall, reliable, with good standing ability and mid-season ripening. A safe first choice.
• 'Hermes' — slightly earlier, useful in the north or on heavier soil where you want the crop off before autumn rain.
• 'Evelin' — fine, pale fibre and good resistance to pasmo, the stem-spotting disease that can wreck a damp-season crop.
• 'Marilyn' — excellent stem quality, though more prone to lodging on rich, sheltered ground.
• 'Solido' and 'Bison' — linseed types, early and sturdy, good for seed in shorter seasons.

Buy fresh seed each year. Seed taken from a fibre crop is harvested at yellow-ripe and is often too immature to germinate well.

Matching Variety to Soil, Site and Sowing Date

Flax likes a light, well-drained loam at pH 6.0–7.0. It hates waterlogging, heavy clay and fresh manure, and it competes poorly against weeds — so give it your sunniest, cleanest bed rather than the awkward corner.

Sow from mid-April to mid-May, once the soil has reached about 7°C. For fibre, sow thickly: roughly 10–12 g per square metre, broadcast or in rows 15 cm apart, aiming for a dense stand of around 2,000 plants per square metre. That competition is what produces tall, unbranched stems. Linseed grown for seed is sown far thinner, around 4–6 g per square metre, so plants have room to branch and fill their capsules.

The main risk is water. Flax flowers over a long period in cool weather, which suits us, but a dry June will shorten stems and cut your fibre yield.

Judging Ripeness and Pulling the Crop

Timing matters more than any other skill. Fibre flax is ready at the yellow-ripe stage, roughly 100–110 days after sowing, when the lower two-thirds of the stems have turned yellow, the leaves have dropped and the capsules are still slightly green. Pull the plants — don't cut them — roots and all, because the longest fibre runs down into the base of the stem. Tie them into small sheaves and stand them upright to finish ripening.

Then ret. Dew retting on grass in a British autumn takes three to six weeks, and the margin between ready and ruined can be a single wet weekend. Check daily: when stems snap cleanly and the fibre slips free of the woody core with a gentle pull, bring them in.

From Straw to Spun Linen, and on to the Dyepot

Break, scutch and hackle the retted straw and you have line fibre ready to spin. Linen rewards patience at the dye stage too: a thorough scour in hot water with soda ash removes the pectins and waxes that otherwise resist colour, and an alum mordant gives a base that takes plant dyes beautifully.

Linen has an affinity for slightly alkaline dyebaths and for the classic dyes you can grow alongside the flax itself — madder root for warm reds, weld for clear yellows, woad for blues, plus onion skins and walnut hulls for soft browns. The colours are rarely flat; they shift in the light and soften with every wash.

Finally, rotate. Never follow flax with flax, and leave five or six years before returning it to the same ground, to avoid the soil-borne wilts and exhaustion that have plagued flax growers for centuries.