Eleanor Hartley
Why the Cottage Garden Makes a Fine Dye Pot
A cottage garden is a generous thing. It gives you sweet peas for the jug, runner beans for the pan, and — if you look at it a certain way — a whole palette of soft, faintly mysterious colour for wool, cotton and linen. Natural dyeing is one of the oldest rural crafts we have, and it sits comfortably alongside preserving, spinning and basket weaving. Nothing about it demands expensive equipment: an old stainless-steel pan, a wooden spoon kept only for dyeing, a sieve and a pair of rubber gloves will see you through.
The colours are not the sharp, flat tones of a chemical dye bath. They are quieter and more changeable — apricot from onion skins, gold from marigolds, a dusty elderberry purple that seems to shift depending on the light. That subtlety is the whole point, and it is why the craft has never quite gone away.
Gathering and Preparing Your Dye Plants
Most dyeing begins in the garden or the kitchen, and the best time to gather is when a plant is at its most abundant. Flowers should be picked fully open and dry, ideally mid-morning once the dew has lifted. Berries want to be properly ripe. Onion skins can be collected all winter and kept in a paper bag in the shed, which is a satisfying use for something you would otherwise throw away.
As a rough guide, start with dye material weighing about half the dry weight of your fibre for pale shades, and equal weights for something stronger. Fresh material is bulkier than dried, so use two or three times as much by volume.
- Chop or bash woody stems and roots to open them up.
- Use only plant parts you know to be safe — some garden plants are toxic, so never guess.
- Keep a notebook of what you used, the weight, and the colour you got. Two seasons of notes are worth more than any book.
Mordanting: The Step That Makes Colour Last
A mordant is a metal salt that binds dye to fibre. Without one, most colours will wash out or fade to nothing within a few weeks. Alum (potassium aluminium sulphate) is the kindest and most reliable choice for the home dyer, and it is widely sold in small quantities for exactly this purpose.
Weigh your dry fibre first, then work out your mordant from that weight — this is the figure dyers call WOF, or weight of fibre. For wool and other animal fibres, use about 10 per cent alum and 5 per cent cream of tartar. For cotton and linen, use 15 per cent alum, and pre-treat plant fibres with a tannin bath first — a strong brew of tea, or oak galls — because they take dye reluctantly otherwise.
Dissolve the mordant in hot water in your dye pan, add enough water to cover the fibre loosely, then lower in the wetted fibre. Bring it slowly to around 80°C — a gentle steam, not a rolling boil — and hold it there for an hour, stirring now and then with the wooden spoon. Leave it to cool in the liquid overnight, then squeeze out the excess. Mordanted fibre can be dyed straight away, or dried and stored for weeks.
Simmering the Dye Bath
Put your plant material in the pan, cover with soft water, and bring it gently to a simmer for anywhere from thirty minutes to two hours, depending on how tough the material is. Onion skins give up their colour in half an hour; woody stems take far longer. Strain the liquor through a sieve, return it to the pan, and add the mordanted fibre.
Now be patient. Wool felts and dulls if it is hurried, so keep the bath at a bare simmer — around 80°C — for an hour, then turn off the heat and let the fibre sit in the cooling liquor until it has reached the shade you want. Some dyers leave it overnight. Rinse in water of a similar temperature, cooling it gradually, to avoid shocking the fibres, and dry in the shade rather than full sun.
Three Dependable Garden Dyes
- Onion skins — the reliable standby. Brown skins give apricot through to deep copper, and need nothing beyond an alum mordant. Yellow skins from milder onions yield a soft gold.
- Marigolds — calendula and the taller African and French marigolds both work well. Fresh or dried flower heads give clear yellows and golds; a dip in an iron modifier turns them a soft olive green.
- Elderberries — picked ripe in early autumn, they give dusky mauves and purples on alum-mordanted wool. Use them within a day of picking or freeze them, and treat the cloth gently afterwards, as the colour is sensitive to strong sunlight.
Shifting the Shade and Caring for the Cloth
One dye bath can give you several colours. After dyeing, dip a sample in a modifier: a splash of white vinegar will brighten pinks and yellows, while a rusty nail left in vinegar for a week makes an iron solution that "saddens" colours towards grey-green and slate. Add it a little at a time, and rinse thoroughly afterwards, as iron can make fibre brittle if it is overdone.
Naturally dyed cloth is honest about its age. It softens and fades slowly in sunlight, so store blankets and knitwear folded in a cupboard rather than hanging them on a sunny wall. Wash in cool water with a mild soap, never a biological detergent, and dry away from direct sun.
What you end up with is rarely a perfectly uniform colour, and that is a pleasure rather than a fault. A jumper the colour of a September hedgerow, dyed from your own garden, carries the season in it — and no two batches will ever be quite the same.
