How to Harvest and Dry Herbs from Your Garden

By late summer the herb patch is at its most generous — basil threatening to flower, oregano billowing, rosemary putting on soft new growth. This is exactly the moment to bank some of that abundance for the cold months, because a jar of herbs you dried yourself is a different ingredient from anything in the supermarket spice aisle. The difference comes down to three decisions: when you cut, how you dry, and how you store.

When to harvest: timing is flavour

The aromatic oils that make herbs worth growing peak just before the plant flowers, and fade through the day as the sun warms the leaves. So the rule is simple: cut mid-morning, after the dew has evaporated but before the heat sets in, and catch each plant just as flower buds appear but before they open. For most leafy herbs you can take up to a third of the plant at once and it will regrow for another harvest — often two or three more before the season ends. With woody herbs like rosemary, sage, and thyme, cut the soft green growth rather than into old bare wood, which regrows poorly.

Wash, dry, sort

Shake off insects, rinse briefly only if the leaves are actually dirty, and pat completely dry — surface water is the number one cause of mouldy bundles. Strip any damaged or yellowed leaves. Then sort your harvest into two piles, because the biggest mistake in herb preserving is treating every herb the same way.

Sturdy herbs: dry them

Low-moisture, small-leaved herbs — rosemary, thyme, oregano, sage, bay, marjoram, savory — dry beautifully and keep most of their flavour. The classic method needs no equipment: gather five to ten stems into a loose bundle, tie with string, and hang upside down somewhere warm, dry, airy, and out of direct sunlight. In one to two weeks the leaves should crumble when pinched. A paper bag with ventilation holes slipped over the bundle keeps dust off and catches falling leaves. If your late-summer air is humid, a dehydrator set to 35–45°C does the same job in a few hours, and an oven at its lowest setting (below about 55°C, door cracked open) works in three to four.

Soft herbs: freeze them

High-moisture herbs — basil, chives, parsley, coriander, mint, tarragon, dill — tend to turn brown or hay-flavoured when air-dried at home. Freezing suits them far better. Chop them and pack into ice-cube trays, top up with water or olive oil, and freeze; each cube is a ready-made portion for soups, sauces, and stews. Whole basil leaves can also be blitzed with oil and frozen flat in a bag, ready to break off by the chunk. Frozen herbs go limp when thawed, so they're for cooking, not garnish — but the flavour stays remarkably close to fresh.

Storage: whole leaves, airtight, dark

• Strip dried leaves from their stems, but store them whole — crumble only when you cook, so the flavour releases in the pan rather than in the jar.
• Use airtight glass jars, labelled with the herb and date, in a cool, dark cupboard — not the shelf above the hob.
• Expect peak flavour for about 3–6 months and useful flavour up to a year; dried herbs don't spoil after that, they just fade.
• Check jars in the first week for any moisture fogging the glass — if you see it, the herbs weren't fully dry; tip them out and dry again before mould starts.

Pro tip: dried herbs are more concentrated than fresh — the standard swap is one teaspoon dried for one tablespoon fresh. Frozen herbs, on the other hand, swap one-for-one with fresh.

Warning: skip the microwave-drying trick for anything but small batches of parsley or celery leaf — a few seconds too long scorches the leaves, and hot oil-rich herbs can genuinely singe. The bundle method is slower and close to foolproof.

Keep the plants producing

Harvesting is pruning by another name: every cut you make above a leaf pair pushes the plant to branch and thicken. Keep pinching flower buds off basil to stretch its season, and give rosemary, thyme, and sage their last real cut by late summer so the regrowth can toughen up before the cold arrives. If you're unsure what's ready in your patch — or whether that volunteer seedling really is oregano before it lands in a jar — PlantMe identifies it from a photo, drawing on 35,000+ plant classes with 93% top-3 accuracy.