Troubleshooting
Rocket Mix Snapdragon problems — and how to fix them
Rocket Mix Snapdragon (Antirrhinum majus) 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.
Antirrhinum rust (Puccinia antirrhini)
The most significant disease — orange pustules on leaf undersides; remove infected material promptly and apply fungicide; choose rust-resistant varieties when available.
Aphids
Target growing tips and flower spikes; treat with insecticidal soap early before populations explode.
Botrytis grey mould
Affects spent spikes in cool, wet conditions; deadhead promptly to remove spent material.
Powdery mildew
Late-season problem in hot, dry conditions; maintain consistent moisture and improve airflow.
Downy mildew
Yellow patches on upper leaf surface with grey-purple fungus beneath; treat with copper fungicide and improve air circulation.
Prevent rocket mix snapdragon problems before they start
Most rocket mix snapdragon issues are care-mismatch, not bad luck. Dial in the basics:
Rocket Mix Snapdragon problems — FAQ
Why is my rocket mix snapdragon antirrhinum rust (puccinia antirrhini)?
The most significant disease — orange pustules on leaf undersides; remove infected material promptly and apply fungicide; choose rust-resistant varieties when available.
Why is my rocket mix snapdragon aphids?
Target growing tips and flower spikes; treat with insecticidal soap early before populations explode.
Why is my rocket mix snapdragon botrytis grey mould?
Affects spent spikes in cool, wet conditions; deadhead promptly to remove spent material.
Why is my rocket mix snapdragon powdery mildew?
Late-season problem in hot, dry conditions; maintain consistent moisture and improve airflow.
Why is my rocket mix snapdragon downy mildew?
Yellow patches on upper leaf surface with grey-purple fungus beneath; treat with copper fungicide and improve air circulation.