Troubleshooting
Snapdragon problems — and how to fix them
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.
Stops flowering in heat
Cool-season plant — cut back in midsummer for autumn rebloom.
Rust on leaves
Orange spots; remove and choose rust-resistant varieties.
Leggy stems
Pinch young plants to encourage branching.
Aphids on flower spikes
Rinse off; ladybirds clean up.
Slow growth
Cool weather slows growth; will pick up.
Prevent snapdragon problems before they start
Most snapdragon issues are care-mismatch, not bad luck. Dial in the basics:
Snapdragon problems — FAQ
Why is my snapdragon stops flowering in heat?
Cool-season plant — cut back in midsummer for autumn rebloom.
Why is my snapdragon rust on leaves?
Orange spots; remove and choose rust-resistant varieties.
Why is my snapdragon leggy stems?
Pinch young plants to encourage branching.
Why is my snapdragon aphids on flower spikes?
Rinse off; ladybirds clean up.
Why is my snapdragon slow growth?
Cool weather slows growth; will pick up.