Troubleshooting
Cheddar Pink problems — and how to fix them
Cheddar Pink (Dianthus gratianopolitanus) 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
Wet, poorly drained soil in winter is the single greatest killer; plant on a slope or in a raised bed, top-dress with coarse grit, and remove dead foliage from the crown in autumn.
Tortrix moth caterpillars
Small green caterpillars of Tortrix moths web leaves together and feed inside the rolled foliage, causing dieback of the mat; remove by hand or treat with Bacillus thuringiensis.
Centre die-back ('opening up')
Mature cushions can die in the centre after 4–5 years; pull apart the mat, discard woody sections, and replant healthy outer growth as unrooted cuttings in late summer.
Prevent cheddar pink problems before they start
Most cheddar pink issues are care-mismatch, not bad luck. Dial in the basics:
Cheddar Pink problems — FAQ
Why is my cheddar pink crown rot in wet winters?
Wet, poorly drained soil in winter is the single greatest killer; plant on a slope or in a raised bed, top-dress with coarse grit, and remove dead foliage from the crown in autumn.
Why is my cheddar pink tortrix moth caterpillars?
Small green caterpillars of Tortrix moths web leaves together and feed inside the rolled foliage, causing dieback of the mat; remove by hand or treat with Bacillus thuringiensis.
Why is my cheddar pink centre die-back ('opening up')?
Mature cushions can die in the centre after 4–5 years; pull apart the mat, discard woody sections, and replant healthy outer growth as unrooted cuttings in late summer.