Troubleshooting
Petunia problems — and how to fix them
Petunia (Petunia × hybrida) 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.
Leggy plant with few flowers
Stop flowering through midsummer; pinch back hard and feed.
Sticky stems and stunted growth
Tobacco budworm or thrips; treat with appropriate insecticide.
Yellow leaves
Iron deficiency in alkaline water; feed with an ericaceous or chelated iron feed.
Brown soggy flowers
Wet weather damage; deadhead to encourage new buds.
Prevent petunia problems before they start
Most petunia issues are care-mismatch, not bad luck. Dial in the basics:
Petunia problems — FAQ
Why is my petunia leggy plant with few flowers?
Stop flowering through midsummer; pinch back hard and feed.
Why is my petunia sticky stems and stunted growth?
Tobacco budworm or thrips; treat with appropriate insecticide.
Why is my petunia yellow leaves?
Iron deficiency in alkaline water; feed with an ericaceous or chelated iron feed.
Why is my petunia brown soggy flowers?
Wet weather damage; deadhead to encourage new buds.