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The hedgerow as a dyer's palette

There is a particular pleasure in walking a late-summer lane, basket in hand, knowing that the brambles and sloes you pass will soon become colour on wool. Bramble and sloe are two of the most generous hedgerow dyes in Britain, and both are forgiving enough for a beginner. The colours they give are rarely flat. They shift with the mordant you choose, the water in your area, the age of the fruit and the fibre you dye. That variability is not a fault; it is the whole point.

Ethical gathering: take a little, leave plenty

Foraging for dye is still foraging. The hedgerow is a larder for birds, small mammals and insects, so treat it with care. Never strip a bush bare, and never dig up roots. A good rule is to take no more than a tenth of what you see, and only where the plant is abundant.

• Seek permission before picking on private land. On public paths, pick only from the hedge side you can reach safely, and leave the rest.
• Avoid busy roadsides, where exhaust pollution and spray settle on leaves and fruit.
• Use secateurs or your fingers gently. Do not tear branches or trample undergrowth.
• Leave sloes for the redwings and fieldfares; they arrive hungry in late autumn.
• Carry a basket or cotton bag rather than a plastic bag, which crushes soft fruit.

Mordants and the dyer's kit

A mordant helps the dye bind to the fibre. For wool and other protein fibres, the classic is alum (potassium aluminium sulphate), with a little cream of tartar. For 100g of dry wool, dissolve 10g alum and 5g cream of tartar in hot water, add the pre-soaked wool, then heat slowly to around 80–85°C. Hold it there for an hour, cool overnight, and rinse. Never boil wool hard, or it will felt.

You will also want a dedicated stainless steel or enamel pan, a wooden spoon, a sieve, and rubber gloves. Iron water is the dyer's magic wand: steep a handful of rusty nails in equal parts water and vinegar for a fortnight, then add a splash to a dye bath to sadden and darken colours. Use it sparingly, and never in an aluminium pan.

Bramble: leaves, shoots and berries

Bramble (Rubus fruticosus) gives different colours from different parts. The young leaves and tips, gathered in spring and early summer before the plant flowers, yield soft yellows and greens. Use roughly 200g of fresh leaves to 100g of fibre. Simmer the leaves for an hour, strain, then add the wetted fibre and simmer for another hour. With alum, expect a pale yellow-green; with a touch of iron water, a deep olive.

The berries are richer. Pick only fully ripe blackberries, leaving plenty for wildlife. Simmer 100g of fresh berries with just enough water to cover them for 30–45 minutes, mashing gently. Strain, add your mordanted fibre, and keep it at a low simmer for 45–60 minutes. Alum gives a soft pink to plum; iron turns it a dusky purple-grey. Bramble berries are best used fresh, but they freeze well for winter dyeing.

Sloes: from blush to shadow

Sloes, the fruit of the blackthorn (Prunus spinosa), are astringent and almost impossible to eat raw, but they are superb in the dye pot. Pick them after the first frost, when their skins have softened, or freeze them overnight to mimic the frost. Use 100g of fruit to 100g of fibre, simmering the bruised fruit for 45 minutes before straining.

With alum, sloes give a delicate pinkish grey or lavender, especially on wool. With iron, the colour deepens to a slate blue-purple that is wonderfully moody. Sloe dye is sensitive to pH: a glug of vinegar in the dye bath can coax out pinker tones, while a pinch of washing soda shifts it toward blue-grey. If you use washing soda, keep the bath brief and rinse well, as alkaline water can rough up wool.

Seasonal rhythm and finishing touches

Dyeing with hedgerow plants ties you to the year. Spring is for bramble leaves and shoots; late summer for berries; autumn for sloes. Keep notes of dates, quantities, mordants and results, because a dye bath is never quite repeatable. After dyeing, rinse the fibre in cool water until it runs clear, then dry it in the shade. Store finished skeins away from direct sunlight.

• Label every skein with the plant, mordant and date.
• Overdye a pale bramble yellow with sloe liquor for complex greens and browns.
• Use a dedicated pot and utensils; dye materials are not for cooking.
• Enjoy the variation. A hedgerow dye is a record of a place and a season, not a factory colour.