The short answer

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Thyme that turns brown, thins or collapses in winter often has roots that have stayed too wet. Established thyme usually copes better with a short dry spell than with soil or compost that stays wet through cool weather.

Check whether the base of the stems is firm, whether live shoots remain and how quickly water drains after rain. Less hardy types may need winter shelter, so check your thyme’s hardiness, especially if it is in a container.

First check
Winter wet at the crown and roots
Best position
Warm, sunny and free draining
Common mistake
Rich, water-retentive compost
Exposure risk
Less hardy types in cold pots

Check whether your thyme is still alive after winter

1. Does thyme normally die back in winter?

Common thyme is evergreen, so widespread collapse is a reason to check the plant, not simply assume seasonal dieback. Cold tolerance varies by type and growing conditions. Compare firm live shoots with soft, dark tissue, and check drainage before deciding whether it can recover.

2. Inspect the crown

Healthy thyme should be firm at the base. Soft, dark stems and roots suggest decay, while dry exposed tips with a living centre may still recover.

3. Watch what happens after rain

A freely draining pot should release excess water. If water remains or compost feels wet for long periods, clear the holes and reassess the mix and position.

4. Check the particular type

Not every plant sold as thyme has identical hardiness. A less hardy ornamental type may need a sheltered container position, while common thyme still needs protection from waterlogged roots.

5. Will thyme grow back after winter?

It may recover if the stem base is firm and live shoots remain. Trim only dead material once fresh growth shows where the live plant ends. If the crown is rotten throughout, start again with better drainage rather than repeatedly treating the foliage.

Growing advice from the sources

Thyme: sunny site and free drainage

Grow thyme in a warm, sunny position with freely draining soil or compost; once established it generally needs little attention, while persistent wetness and overwatering are more concerning than short dry periods. Source: Royal Horticultural Society

Thyme: winter wetness and root decline checks

When thyme declines over winter, check whether soil or compost has stayed damp because winter wetness can cause root rot; also check the hardiness of the particular type, as less hardy thyme may need a sheltered container position. Source: Royal Horticultural Society

Help thyme through winter with good drainage

Wet roots can cause thyme to decline in winter. Choose a sunny, raised position or gritty, fast-draining compost, and check that pot holes are open. Containers may need a more sheltered winter spot, especially for less hardy types. Improving drainage is more useful than feeding a plant with wet, decaying roots.

What not to do first

  • Do not water a wet winter pot because the foliage is brown.
  • Do not plant thyme into a low pocket where rain collects.
  • Do not assume all thyme types have the same cold tolerance.
  • Do not feed a plant whose roots are decaying.

Sources and review

Garden Sage paraphrased these plant notes and checked them against the horticultural sources linked below. They have not been reviewed by a botanist. Read our editorial standards.