Growing Flax for Linen
Linen comes out of the stem of a flax plant, not the seed. That one sentence decides everything else on this page: which seed to buy, how densely to sow it, when to pull it, and why the plant you grow for linen is not the plant that gives you flaxseed to eat.
Flax seed is not what makes linen. The fibre runs the length of the stalk, bound to a woody core. Growing flax for seed and growing it for fibre are two different crops with different varieties, spacings and harvest dates. You can get a little of both from one planting, but you will do neither well.
Hemp does not make linen. Hemp bast fibre makes hemp cloth. The two are often sold under similar language and they are not the same fibre — linen is Linum usitatissimum, and that word only ever means flax.
Hemp also needs a licence. In the United States, growing hemp — including fibre varieties with no useful THC — requires a licence under a USDA or state programme, with registration and mandatory testing. That is true for one plant in a garden bed. Flax needs nothing.
So: flax, and a fibre variety. This page takes one bed from seed to combed fibre ready to spin. It is a full season of growing and a winter of processing.
1. Buy the right seed
Ask for a fibre flax cultivar — the names that come up are Marilyn, Evelin, Electra, Ariane. Fibre types grow tall and unbranched; oilseed types grow short and branch hard, because branching is where seed comes from and where fibre length goes to die.
Do not sow the flaxseed from your kitchen. It is an oilseed variety, it may be heat-treated, and even if it germinates it will give you a knee-high branchy plant with fibre too short to be worth the retting.
2. Sow thickly, and mean it
Flax is sown dense on purpose. Crowded plants compete for light, grow straight up, and do not put out side branches — and an unbranched stem is one long fibre. Give flax room and it behaves like a weed with ambitions.
| For fibre | For seed | |
|---|---|---|
| Seed rate | Roughly 1½–2 oz per 32 sq ft (a 4′ × 8′ bed) | About a third of that |
| Habit wanted | Tall, single-stemmed, no branching | Branched, more seed heads |
| Harvest | ~90–110 days, before seed hardens | Full maturity |
Broadcast it, rake it in about a quarter to half an inch, and water it in. Sow in early spring as soon as the soil can be worked — flax wants a cool start and dislikes summer heat. Do not thin it.
Weed once, early, while the seedlings are small. After that the stand closes over and looks after itself.
3. Pull it, do not cut it
This is the step people get wrong, and it cannot be undone. Flax is harvested by pulling the whole plant, root and all. Every inch of stem is fibre, and cutting throws away the bottom of it and leaves a ragged end that fouls the combs later.
Grab a handful at the base, pull steadily, shake the soil off, and lay it in bundles with all the root ends together. Keeping the bundle aligned from the start saves an hour of misery at the hackle.
When: the ripeness window
Pull at early yellow ripe — the bottom third of the stems has turned yellow, the lower leaves have dropped, and the seed bolls are yellow-brown but the seed inside is still soft.
- Earlier gives finer, softer fibre and less of it, and it is weaker.
- Later gives more fibre and stronger fibre, coarser and harder to process, because the stem has begun to lignify.
The window is roughly a week. If you want seed to sow next year, that is what rippling is for: draw the bundles through a coarse comb to strip the bolls off before retting, and dry them.
4. Ret it — the step that decides everything
Retting is controlled rotting. Bacteria and fungi eat the pectin gluing the fibre bundles to the woody core, so the two will separate. Under-ret and the fibre will not come free at all. Over-ret and it comes free grey, weak and worthless. There is no fixing either afterwards.
Dew retting is the beginner's method. Spread the flax in a single thin layer on short grass, turn it every few days so both sides get the same weather, and leave it two to three weeks depending on rain and warmth. It is slow, it is weather-dependent, and it is very hard to ruin.
Water retting submerges the bundles in a tub or tank for four to ten days. It is faster and gives paler, more even fibre. It also smells genuinely bad, it goes from perfect to ruined in about a day, and the water must be checked daily.
Take a stem and bend it sharply. The woody core should snap while the fibre stays whole, and you should be able to peel a ribbon of fibre away from the core along most of the length with your fingers.
If the fibre breaks with the core, it needs longer. If it is grey, slimy, or comes apart when you pull it, you have gone too far. Test daily once you are near, because the last day is the one that matters.
Then dry it thoroughly — properly, right through. Damp flax put away will keep retting in the bundle and go mouldy. Dried retted straw stores indefinitely, which is why the processing traditionally happened in winter.
5. Break, scutch, hackle
Three mechanical steps, all of which do the same thing: get the wood out and leave the fibre.
- Breaking. Crush the stems so the woody core shatters into short pieces called boon. A flax brake is a hinged wooden jaw; a rolling pin and a hard edge will get you through one bed.
- Scutching. Hang a handful over an upright board and scrape downward with a wooden blade to knock the broken boon out. Outdoors. This makes a remarkable mess.
- Hackling. Draw the fibre through beds of nails, coarse to fine, to comb it straight and pull out the short tangled stuff. What passes through is line — long, aligned, for smooth thread. What is combed out is tow — short and tangled, still perfectly good spun coarser.
What you actually get
Expect a 4′ × 8′ bed to give a few ounces of line flax after everything, plus tow. That is enough for a scarf's worth of fine thread if you spin well, and rather less if it is your first retting.
This is not a discouraging number, it is the point. Every metre of linen in every historical inventory represents a plot, a season, a bad-smelling fortnight and a winter of combing. Growing a bed of it is the fastest way to understand why linen sheets were listed in wills.
The year, in order
| When | What |
|---|---|
| Early spring | Sow thickly as soon as the soil can be worked |
| + 2–3 weeks | Weed once, then leave it alone |
| + 90–110 days | Pull at early yellow ripe; ripple off the seed |
| Then 2–3 weeks | Dew ret on grass, turning every few days |
| Then | Dry thoroughly and store |
| Winter | Break, scutch, hackle, spin |
Seed rates and timings are the usual published ranges for temperate growing and will shift with your season. Your last frost date sets the sowing end of this, and the spacing calculator is no use here at all — flax is the one crop on this site you are supposed to crowd.