Troubleshooting
America Rose problems — and how to fix them
America Rose (Rosa 'America') 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.
Black spot
Circular black leaf spots with yellow margins in humid weather; clear fallen foliage and keep leaves dry by watering at the roots.
Aphids
Sap-sucking colonies on buds and new shoots distort flowers; dislodge with a water jet or apply insecticidal soap early.
Powdery mildew
Greyish-white film on young growth in dry, still conditions; thin congested canes to improve airflow.
Stem dieback
Canes browning from the tip after frost or canker; prune back to healthy green wood with clean cuts in spring.
Prevent america rose problems before they start
Most america rose issues are care-mismatch, not bad luck. Dial in the basics:
Looking for america rose in general rather than its problems? Read the full america rose care guide — light, water, soil and feeding.
America Rose problems — FAQ
Why is my america rose black spot?
Circular black leaf spots with yellow margins in humid weather; clear fallen foliage and keep leaves dry by watering at the roots.
Why is my america rose aphids?
Sap-sucking colonies on buds and new shoots distort flowers; dislodge with a water jet or apply insecticidal soap early.
Why is my america rose powdery mildew?
Greyish-white film on young growth in dry, still conditions; thin congested canes to improve airflow.
Why is my america rose stem dieback?
Canes browning from the tip after frost or canker; prune back to healthy green wood with clean cuts in spring.