The short answer

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Rosemary turning brown after winter or a wet spell often points to roots staying too wet, exposure damage or old woody growth—not a need for more water. The plant wants sun and free drainage, and a pot or heavy garden bed can remain saturated long after the surface looks dry.

Check the crown, drainage and live tissue in several stems. If the base is firm and green growth remains, improve the conditions and prune only clearly dead tips.

First check
Wet compost or soil around the roots
Best position
Sunny, sheltered and free draining
Pruning risk
Hard cuts into old bare wood
New planting
Water in dry spells during year one

Separate wet-root decline, exposure and old wood

1. Look at the stem base

Soft, dark tissue where stems meet the soil suggests decay. Dry brown tips with a firm base may reflect exposure or local dieback instead. Check more than one stem before deciding.

2. Test drainage after rain

See whether water clears from the pot and whether the root zone remains sodden for days. Raise a container only where it is stable and make sure its drainage holes are open.

3. Check the pruning line

Rosemary can be lightly trimmed after flowering, but severe cuts into old bare wood may not reshoot. Browning below an old hard cut may be a pruning response rather than a new disease.

4. Watch the replacement growth

Remove only clearly dead material, give the plant the sun and drainage it needs, and assess new shoots. If the whole crown and root system have decayed, replacement in a better position may be the honest answer.

What the reviewed sources support

Rosemary — site, establishment and watering context

Grow rosemary in a sunny position with freely draining soil or compost; established plants tolerate drought, but newly planted rosemary needs watering during dry spells in its first year, without leaving roots waterlogged. Source: Royal Horticultural Society

Rosemary — pruning and winter exposure

Trim rosemary lightly after flowering without cutting severely into old bare wood, and shelter container plants in severe cold because exposed sites can damage less hardy forms even though most plants tolerate typical UK winters. Source: Royal Horticultural Society

Keep rosemary sunny, sheltered and free draining

Rosemary responds more to root-zone moisture and exposure than to a region label. In rainy or humid winters, drainage and airflow are the priority. In hot, dry conditions, a new plant may need deep watering while it establishes. Containers add both drying and saturation risk, so check the full root ball before acting.

What not to do first

  • Do not water because the foliage looks dry while the roots are wet.
  • Do not cut all stems back into bare old wood.
  • Do not use a water-retentive outer pot without checking for trapped water.
  • Do not add feed to a plant with a soft, decaying crown.

Sources and editorial basis

This page uses Garden Sage passages that were editorially paraphrased, reviewed against the cited horticultural sources and admitted to the app’s governed knowledge base. It does not claim review by a botanist. Read our editorial standards.