Troubleshooting
Silver Tansy problems — and how to fix them
Silver Tansy (Tanacetum niveum) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown rot in wet winters
The main cause of plant loss in the UK and wetter climates. Ensure very sharp drainage; add grit under and around the crown. Grow in raised beds or a south-facing slope if the native soil is heavy.
Flopping / open habit
Over-rich soil or too much shade causes stems to spread excessively and flop. Cut back hard after flowering to encourage a compact mound; reduce or eliminate feeding and ensure full sun.
Botrytis (grey mould)
Trapped moisture in the dense silver foliage can lead to grey mould in humid conditions. Remove affected growth promptly, improve air circulation, and avoid wetting the foliage when watering.
Prevent silver tansy problems before they start
Most silver tansy issues are care-mismatch, not bad luck. Dial in the basics:
Silver Tansy problems — FAQ
Why is my silver tansy crown rot in wet winters?
The main cause of plant loss in the UK and wetter climates. Ensure very sharp drainage; add grit under and around the crown. Grow in raised beds or a south-facing slope if the native soil is heavy.
Why is my silver tansy flopping / open habit?
Over-rich soil or too much shade causes stems to spread excessively and flop. Cut back hard after flowering to encourage a compact mound; reduce or eliminate feeding and ensure full sun.
Why is my silver tansy botrytis (grey mould)?
Trapped moisture in the dense silver foliage can lead to grey mould in humid conditions. Remove affected growth promptly, improve air circulation, and avoid wetting the foliage when watering.