Troubleshooting
Altissimo Rose problems — and how to fix them
Altissimo Rose (Rosa 'Altissimo') 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
Dark leaf blotches with yellowing in wet seasons; less prone than many climbers, but remove fallen leaves and ensure airflow to limit spread.
Aphids
Cluster on soft new shoots and buds in spring; blast off with water or treat with insecticidal soap before they distort growth.
Poor repeat bloom
Skipping deadheading and the post-flush feed reduces later flowering; remove spent blooms and feed after the first flush to encourage rebloom.
Powdery mildew
White coating on young leaves in dry, stagnant air; improve spacing and water at the roots, not overhead.
Prevent altissimo rose problems before they start
Most altissimo rose issues are care-mismatch, not bad luck. Dial in the basics:
Looking for altissimo rose in general rather than its problems? Read the full altissimo rose care guide — light, water, soil and feeding.
Altissimo Rose problems — FAQ
Why is my altissimo rose black spot?
Dark leaf blotches with yellowing in wet seasons; less prone than many climbers, but remove fallen leaves and ensure airflow to limit spread.
Why is my altissimo rose aphids?
Cluster on soft new shoots and buds in spring; blast off with water or treat with insecticidal soap before they distort growth.
Why is my altissimo rose poor repeat bloom?
Skipping deadheading and the post-flush feed reduces later flowering; remove spent blooms and feed after the first flush to encourage rebloom.
Why is my altissimo rose powdery mildew?
White coating on young leaves in dry, stagnant air; improve spacing and water at the roots, not overhead.