Troubleshooting
Carding Mill Rose problems — and how to fix them
Carding Mill Rose (Rosa 'Carding Mill') 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.
Blackspot
Black-edged spots and leaf drop after wet weather; rake up infected leaves, water at the base, and keep the centre of the bush open.
Aphids
Sap-sucking colonies on tender new growth in spring; blast off with water or treat with insecticidal soap before buds are deformed.
Rose rust
Orange pustules on leaf undersides in humid conditions; remove affected foliage promptly and improve air circulation.
Petal balling
Heavy cupped blooms may stick shut and brown in persistent rain; ease the outer petals apart by hand to help flowers open.
Prevent carding mill rose problems before they start
Most carding mill rose issues are care-mismatch, not bad luck. Dial in the basics:
Looking for carding mill rose in general rather than its problems? Read the full carding mill rose care guide — light, water, soil and feeding.
Carding Mill Rose problems — FAQ
Why is my carding mill rose blackspot?
Black-edged spots and leaf drop after wet weather; rake up infected leaves, water at the base, and keep the centre of the bush open.
Why is my carding mill rose aphids?
Sap-sucking colonies on tender new growth in spring; blast off with water or treat with insecticidal soap before buds are deformed.
Why is my carding mill rose rose rust?
Orange pustules on leaf undersides in humid conditions; remove affected foliage promptly and improve air circulation.
Why is my carding mill rose petal balling?
Heavy cupped blooms may stick shut and brown in persistent rain; ease the outer petals apart by hand to help flowers open.