A stone shed at the end of a track

The shed sits at the end of a rutted track, built from the same grey stone as the walls around it, with a slate roof and a door that swells in wet weather. Inside there is room for a copper, a workbench, a stack of dye pots and a woodburner. On the bench: a set of scales, a notebook with a permanent ring where a lid of madder root once rested, and a row of glass jars holding dyestuff in various stages of drying.

"Nothing in here looks very romantic in February," she says, lifting a lid. "But the pots know what they're doing."

Outside, a rainwater butt feeds a tap over a plastic sink. That matters more than you would think. The tap water here is hard, drawn from limestone, and while madder loves it, weld and woad behave quite differently in it. So the butt fills all winter and the soft, slightly acidic rain goes to the blue vat, while the hard tap water goes to the reds.

Weld, madder and woad: a year in the dye garden

Behind the shed, a plot no bigger than a decent vegetable patch supplies most of her colour. Three plants do the heavy lifting.

• Weld — sown in April, cut at flowering in July when the seed heads are just turning. Dried in bunches from the shed beams, it keeps its yellow for a year or more.
• Madder — a three-year commitment. Roots are lifted in October, scrubbed, chopped and dried for at least six months before use. The older the root, the deeper the orange-red.
• Woad — first-year leaves, cut two or three times across the summer. Each cut gives a smaller leaf and a milder blue, which is one reason the colour shifts through the season.

Alongside those, there is rhubarb leaf for a soft olive, alder cones for greys and browns, onion skins saved in a paper sack by the door, and nettle cut from the lane for a green-tinged beige that sells better than it sounds.

In the pots: mordants, temperatures and patience

Everything is measured by weight of fibre. The mordant comes first: usually alum with a little cream of tartar, roughly 10–15% of the dry weight of the yarn, simmered gently for an hour and then left to cool overnight. Skipping the overnight rest is the most common mistake. The mordant needs time to settle into the fibre, not just touch it.

The dye bath itself is where the difference between a bright colour and a beautiful one is decided:

• Weld at 80°C, held for an hour, then left to cool in the pot. Boiling turns it brassy.
• Madder at 60–70°C for an hour, no higher. Push it past that and the red dulls towards brown and never comes back.
• Woad in a cool vat, around 40°C, with soda ash to lift the pH and plenty of aeration — pouring between buckets, whisking, letting the liquid go from green to blue before the fibre goes in.

Iron liquor is kept in a jar with a tight lid and used by the capful. A small amount saddens a colour into a stone grey; too much and the fibre goes harsh and brittle. Copper turns weld green. Both are used sparingly, and mostly to knock the brightness back into something that will sit quietly in a room.

Why the colours move with the season

Ask for a repeat of last year's pale yellow and you will get something close, but not identical. Water, plant maturity, drying time and even the temperature of the shed all leave a mark. She keeps a sample of every batch wound onto card, labelled with the date, the dyestuff, the mordant and the pH.

"I used to think that was a failure," she says. "Now I think it's the point. A customer who buys a cushion in June and a second one in November gets two slightly different cushions. That's not a fault, it's a season."

The shifts are subtle but real. Summer weld gives a clear, green-tinged yellow; late-season weld is softer and more buttery. Madder lifted after a wet autumn runs towards terracotta. Woad vats are truest in the colder months, when the water is cool and the fermentation is slow.

Living with slow colour at home

Naturally dyed textiles ask for a certain kind of home — not a precious one, just an attentive one. The colours are muted enough to layer without arguing: oatmeal and woad blue, madder pink and undyed wool, weld yellow against bare plaster or limewash. They read beautifully against old timber, worn flagstones and linen that has already been washed a hundred times.

A few practical notes if you are bringing them home:

• Wash cool and by hand, with a pH-neutral soap. Alkaline detergent will shift madder towards orange over time.
• Dry in the shade. Direct sun fades woad faster than anything else on the shelf.
• Expect change, and enjoy it. A naturally dyed linen teacloth will soften and lighten over a few years, in the way that a good wooden table darkens.
• Keep iron-dyed pieces away from damp cupboards, and patch rather than replace when something wears through.

By mid-afternoon the shed is warm and faintly sour with the smell of the woad vat. She lifts a skein out, watches it turn from yellow-green to blue in the air, and hangs it on the line beside the others. Tomorrow the pot will be emptied onto the beds, the notes will be written up, and the colour will have moved on again.