The short answer

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A lavender that turns gray, brown or collapses after winter is often struggling with persistent wet around the roots, especially in heavy soil or a container that cannot drain. Cold injury can look similar, so check the roots, crown and live stems before choosing a cause.

Inspect drainage, the stem base and whether there is live growth lower down. If roots or the crown are soft and decaying, extra water and feed will not solve the cause.

First check
How long the root zone stays wet
Best position
Sunny and fast draining
Pruning risk
Cutting into old bare wood
Container check
Open drainage holes

Check live stems, the crown and winter drainage

1. Test whether stems are alive

Look for flexible stems, green tissue beneath a light scratch and new buds. Brittle stems that are brown through their cross-section are dead; check several areas before deciding the whole plant has gone.

2. Inspect the base and drainage

A dark, soft or unpleasant-smelling crown points toward decay. Check whether water pools around the plant, whether dense soil remains wet and whether a pot has blocked holes or sits inside a water-filled cover.

3. Review last year’s pruning

Lavender responds to regular light trimming after flowering, but severe cuts into old leafless wood may not regrow. An unpruned plant can also become woody and open in the centre, which is ageing rather than a sudden disease.

4. Decide whether recovery is realistic

If live shoots remain and the base is firm, remove only clearly dead tips and improve the growing conditions. If the crown and most roots have rotted, replacing the plant in a drier position is usually more realistic than repeated treatment.

What the reviewed sources support

Lavender — site, drainage and watering

Lavenders need a sunny position and fast-draining soil; persistent winter wet or heavy soil raises the risk of root loss. Newly planted specimens need water while establishing, whereas established plants in open ground tolerate dryness better than container plants. Source: Royal Horticultural Society

Lavender — pruning and wet-soil decline

Annual trimming after flowering helps lavender remain compact, but cutting deeply into old woody stems is risky because regrowth is limited. When a lavender declines in wet or heavy ground, poor drainage and root rot should be checked before adding more water or feed. Source: Royal Horticultural Society

Give lavender sun, air and fast drainage

Choose the site by what happens at the roots. In humid or high-rainfall gardens, a raised bed, gravelly pocket or fast-draining container can be safer than a low, wet bed. In hotter, drier gardens, a new plant may still need deep watering while it establishes. Sun, drainage and a firm crown matter more than a regional label.

What not to do first

  • Do not water on a calendar during wet winter weather.
  • Do not bury the crown deeper to make a loose plant look stable.
  • Do not cut hard into old bare stems and expect reliable regrowth.
  • Do not assume fertilizer will repair rotten roots.

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.