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Clematis Wilt

Disease

Clematis Wilt is a sudden fungal disease that causes the stems of susceptible clematis varieties to collapse and wither overnight. It is a frustrating issue because it can strike healthy looking plants, though the root system usually remains alive and capable of sending up new growth.

Symptoms by part

Stems

The stem suddenly wilts and turns brown or black, often starting from the tip and moving downward, while the rest of the plant may appear perfectly healthy.

Causes

  • Infection by the fungus Phoma clematidina which enters through wounds or natural openings in the stem.
  • High humidity and warm temperatures that favor fungal growth.
  • Physical damage to the stem base from tools, pets, or wind.

Could be confused with

  • Slime flux · Slime flux causes a foul smelling ooze at the base of the stem, whereas wilt causes a clean, dry collapse.
  • Drought stress · Drought stress causes the entire plant to droop gradually, while wilt strikes specific stems suddenly.

Treatment

  1. Cut the affected stem back to the first healthy node or all the way to the soil line immediately upon seeing signs of collapse.
  2. Dispose of all pruned material in the trash, never in the compost pile, to prevent fungal spores from lingering.
  3. Clean your pruning shears with a solution of one part bleach to nine parts water after every cut to avoid spreading the fungus to other parts of the plant.

Without chemicals

  • Prune out all dead or damaged stems promptly.
  • Plant clematis slightly deeper than they were in their nursery pot to encourage new shoots from below the soil surface.
  • Provide a support structure to prevent stems from whipping in the wind and sustaining injury.

Preventing it

  • Choose resistant cultivars, especially those in the Viticella group.
  • Avoid wounding the stems when weeding or working near the base of the plant.
  • Ensure good air circulation around the base of the plant to keep the foliage dry.

Season

The warm growing season.

Spread risk

Low

Severity

Moderate

When to act

Act the moment you notice a stem wilting to stop the fungus from traveling further down. If the plant fails to produce new growth from the base after a full season, it is time to remove it.

Think it's Clematis Wilt?

This guide covers the general picture. Pocket Botanist looks at your actual plant from a photo and tells you what's really going on, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Will my clematis die if it gets wilt?
Usually no, the roots remain healthy and will often sprout new stems from the base later in the season or the following year.
Should I dig up the plant if it wilts?
There is no need to dig it up, as the root system is rarely killed by the fungus. Simply prune the damaged stems and let the plant recover.

Plants it affects

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This guide was generated with AI and is general information, not horticultural advice. Read about how we build these guides.