Start With a Dry Morning

Rosemary, sage and thyme are the backbone of a British winter kitchen. They carry roast lamb, sausages, stuffings, casseroles, soups and traybakes of root vegetables through the cold months, and a well-stocked jar of your own dried herbs costs nothing but an hour in late summer. The trick is to catch them at their best and dry them slowly and gently, so the essential oils stay locked in the leaf rather than evaporating away.

Choose a dry, still morning, ideally after two or three rain-free days. Wait until the dew has lifted but the sun has not yet grown hot — mid-morning is usually perfect. Picking wet herbs invites mould, and picking in the heat of the day means the plant has already released some of the aromatic oils you are trying to capture. Snip with sharp scissors or secateurs, cutting cleanly just above a leaf joint, and take no more than a third of the plant so it has time to bush out again before the frosts.

• Thyme: cut whole sprigs close to the base, leaving the woody framework intact.
• Rosemary: take lengths of 10–15cm from the softest new growth, avoiding old woody stems.
• Sage: harvest before the plant flowers, when the leaves are plump and grey-green rather than leathery.

Tie Small Bunches, Not Fat Ones

Back in the kitchen, shake each bundle gently to dislodge insects and any garden grit. Try not to wash the herbs — water is the enemy of good drying. If a plant is dusty or has been splashed with soil, rinse it quickly in cool water, shake off the excess and lay the stems on a clean tea towel in a cool room for a few hours until they are dry to the touch.

Strip the lower leaves from each stem; use those straight away in that evening's cooking. Then gather the stems into bunches no thicker than a two-pound coin, with roughly six to eight stems apiece. Tie each bunch tightly near the base with garden twine, leaving a long loop for hanging. Loose, airy bunches dry evenly and quickly. A fat, tightly bound bundle traps moisture in the middle and will turn black and musty before the outside is even crisp.

The Right Room Makes All the Difference

Hang your bunches in a dark, dry, well-ventilated room. A spare bedroom, a cool loft or a walk-in pantry is ideal. Aim for something in the region of 15–24°C with good air movement, and keep the herbs out of direct sunlight, which bleaches the colour and breaks down the oils that give them their punch. Space the bunches at least 10cm apart so air can circulate freely between them; a length of string stretched across a spare room, or an old wooden clothes airer, works beautifully.

Keep them well away from the kitchen and utility room. Steam, cooking fumes and the damp warmth of a tumble dryer will undo your efforts and leave you with herbs that taste of nothing much. Airing cupboards are temptingly warm, but only use one if it is genuinely dry and you can leave the door ajar.

If dust or falling leaves are a nuisance — thyme in particular sheds as it dries — slip a paper bag over each bunch, punch a few holes in the sides and tie the bag loosely around the stems. The bag catches the debris and keeps light off the leaves while still allowing air to move.

Testing for Dryness

Drying times vary with the weather and the room. Thyme and sage are usually ready in one to two weeks; rosemary can take two to three. Check them weekly and trust your senses rather than the calendar.

• The stems should snap cleanly, not bend like green wood.
• The leaves should rustle and crumble easily between finger and thumb.
• A crushed leaf should release a strong, clean aroma.

If any stem still feels cool, limp or leathery, leave the bunch hanging for another week. It is far better to over-dry than to jar herbs that are still holding moisture — those will sweat in the container and go mouldy within a month.

Stripping and Storing

Once fully dry, strip the leaves over a large bowl or a sheet of baking paper. Thyme and sage can simply be rubbed between your palms; rosemary leaves are tougher, so hold the stem at the top and pull downwards against the direction of growth. Keep the leaves whole rather than crushing them finely — whole leaves hold their fragrance far longer, and you can crumble them at the moment of use.

Store in small glass jars with tight-fitting lids, kept in a dark cupboard away from the hob and the kettle. Label each jar with the herb and the month you dried it. Whole dried leaves will keep their colour and scent for around a year; anything ground or crushed is best used within three or four months.

Cooking Through the Winter

Dried herbs need a little more time and warmth to give up their flavour than fresh ones, so add them early. Tip out what you need, crumble it between your fingers straight into the pot, and give stews, casseroles, soups and braises a good half hour to draw out the aroma. As a rough guide, one teaspoon of dried herb stands in for a tablespoon of fresh.

Rosemary suits lamb, roast potatoes and white beans; sage is made for pork, onion stuffing and squash; thyme flatters chicken, mushrooms and any root vegetable you care to roast. If a jar has lost its scent, don't persevere with it — tip the contents onto the compost heap, give the jar a wash and start again next summer.