Thyme is the low, creeping herb of Mediterranean cooking — tiny leaves with an intense, earthy flavour, on a plant that hugs the ground and thrives on neglect. It grows in the cracks of paving, over the edges of raised beds, and in the poorest, driest soil in the garden, and it tastes better for it: thyme grown in rich, wet soil is bland, while thyme grown lean and dry is powerfully aromatic.
Thyme takes 70–90 days to reach a useful size, and it is a perennial that will live for years if it has sun and sharp drainage. It is slow from seed — 14–21 days to germinate — so many gardeners buy a plant, but seed is cheap and a packet gives you dozens of plants. This guide covers growing thyme from seed or plant, the dry conditions it loves, and harvesting for the strongest flavour.
Thyme at a glance
| Growing factor | What this crop needs |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–8.0 |
| Days to germination | 14–21 |
| Days to maturity | 70–90 |
| Spacing | 9–12 inches |
| Water needs | low |
| Cold tolerance | hardy |
| Family | Lamiaceae |
Starting seeds
Thyme can be started indoors or sown directly, and which you choose depends on your season. Indoor sowing gives you a head start in cold zones; direct sowing is simpler and avoids transplant shock. Either way, germination takes 14–21 days in warm, moist soil. Our seed-starting calculator can work out indoor sowing dates, and the seed-spacing calculator works out how many seeds you need for your bed.
This is a hardy crop, so it suits the cool parts of the year: in Zones 3–5 sow in early spring and again in late summer; in Zones 6–8 spring and autumn sowings do well, with summer sowings struggling in heat; in Zones 9–10 sow through autumn, winter and early spring; and in Zones 11–13, which are frost-free, grow it in the cooler months with afternoon shade. Check your dates with our frost-date calculator or the last-first frost lookup — and when in doubt, ask your local extension service.
Thyme can be started indoors or sown directly, and germination takes 14–21 days. The seed is dust-fine, so sow on the surface of fine compost and do not cover it — light helps it germinate.
Transplanting and planting out
Harden seedlings off for a week before planting out: put them outside for a few hours a day, increasing the time and exposure, and bring them back in at night. Plant out at the final spacing of 9–12 inches apart, in holes the same depth as the pot. Water each plant in well and mulch around (not against) the stems to hold moisture. Our plant-spacing calculator shows how many plants fit your bed at 9–12-inch spacing.
Soil and feeding
Thyme grows best in soil with a pH of 6.0–8.0, so test your soil before you plant — a cheap test kit tells you more than guessing ever will. Work in a little compost to improve structure, but keep the soil lean — herbs prefer soil that is not over-rich — and make sure the bed drains freely. Our soil-volume calculator and raised-bed soil calculator work out how much soil or compost your bed needs.
Feed lightly: herbs grown in soil that is too rich produce lots of soft leaf with diluted flavour. A little compost at planting time is usually enough, with at most a light feed in spring. Our fertiliser calculator works out how much to apply if your soil is genuinely poor.
Thyme wants poor, sharp, well-drained soil, and it tolerates a wide pH range — 6.0–8.0, including alkaline soils where other herbs struggle. Do not over-feed: rich soil makes soft, flavourless growth.
Watering
This crop prefers life on the dry side. Water only when the soil has dried out, and then water deeply rather than little and often. Overwatering is the most common way to kill it — wet roots rot, and damp foliage invites mildew. In containers, let the pot dry between waterings and always empty the saucer. Our watering calculator gives a starting point for your bed size and soil, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Give Thyme full sun — at least six hours of direct sun a day, and more is better in most zones. Sun drives flavour and yield in this crop, and plants in shade stay leggy and unproductive. Our sunlight calculator can check whether your spot gets enough sun.
It is hardy and copes with cool weather and light frost. In cold zones it dies back and regrows in spring; in warm zones it grows through the year, with a little afternoon shade in the hottest weather.
Pests and diseases
The pests and diseases to watch for with Thyme are aphids, spider mites and whiteflies.
Aphids cluster on tender new growth and under leaves, sucking sap and leaving sticky honeydew.
Spider mites are tiny, thrive in hot dry conditions, and leave fine webbing and speckled leaves.
Whiteflies cloud up from the undersides of leaves when disturbed.
Prevention beats cure: rotate crops so the same family does not grow in the same bed year after year, clear debris at the end of the season, and inspect the undersides of leaves weekly. Our pest identifier helper can help you name a pest from its damage, and the plant-disease checker can narrow down a leaf problem.
Companion plants
Good companions for Thyme are tomatoes, peppers, marigolds and cabbage.
Tomatoes share this plant's love of sun and rich soil, and the pairing works well when both get enough space and airflow.
Peppers enjoy the same warm, sunny bed and similar watering, so they make a natural neighbour.
Marigolds are the classic companion: their roots and scent deter several soil pests, and their flowers bring in pollinators and beneficial insects.
Cabbage shares similar soil and water needs, and planting herbs nearby helps confuse the cabbage white butterfly.
Plant companions in the same bed rather than in a separate corner — that is how they do their work. Our companion-planting finder can suggest more pairings for your bed.
Harvesting
Thyme is ready about 70–90 days after sowing, but a plant grown from a bought plant can be picked within weeks. Harvest by cutting sprigs with scissors, taking the top few inches: regular picking keeps the plant bushy and delays flowering. Pick in the morning, when the oils are strongest, and never take more than a third of the plant at once. The flavour is strongest just before the plant flowers.
Thyme dries beautifully: hang small bunches upside down in a warm, airy place, then strip the leaves into a jar. Dried thyme keeps its flavour for months, which is why it is one of the most useful herbs to preserve. In spring, trim the plant lightly to remove dead wood and keep it compact, and divide or replace plants every three or four years — old thyme becomes woody in the centre and loses vigour.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Plant rots and dies in winter | wet soil in cold weather | Grow in gritty, free-draining soil or a pot; never let it sit wet in winter. |
| Centre of plant goes bare and woody | old age and no pruning | Trim lightly each spring and replace plants every three to four years. |
| Leaves lose flavour | soil too rich or too wet | Stop feeding, let the soil dry, and give the plant more sun. |
Plant rots and dies in winter
Likely cause: wet soil in cold weather. Thyme dies in winter not from cold but from wet: roots sitting in cold, soggy soil rot. The fix is drainage — gritty soil, a raised bed or a pot — and watering hardly at all in winter.
Centre of plant goes bare and woody
Likely cause: old age and no pruning. Thyme becomes woody in the centre as it ages, with bare stems and growth only at the tips. Trim lightly each spring to encourage new growth from the base, and divide or replace plants every three or four years — young plants are far more productive than old, woody ones.
Leaves lose flavour
Likely cause: soil too rich or too wet. Bland thyme has usually been grown too rich and too wet. Thyme's flavour comes from stress — sun, poor soil and dry conditions concentrate its oils.
Frequently asked questions
How long does thyme take to grow?
Thyme takes 70–90 days from seed to a usable plant, with germination alone taking 14–21 days. It is slow in its first year, so many gardeners buy a small plant for a faster harvest.
Does thyme need a lot of water?
No — thyme needs very little water and is drought-tolerant once established. Overwatering is the commonest way to kill it.
Can thyme grow in pots?
Yes — thyme grows very well in pots, which is often the best choice because you control the drainage. Use a gritty compost mix, a pot with drainage holes, and the sunniest spot you have.
Why is my thyme plant dying?
Almost always wet roots: thyme hates wet soil, especially in winter. Check drainage, let the soil dry between waterings, and if the plant is in heavy clay, move it to a pot or raised bed with gritty compost.