Answer: If you've ruled out slugs and snails, the culprit could be earwigs. These pests usually hide in dark spaces, including between flower petals. While they normally eat only decaying debris, the population could be large enough that the competition for food is high, making your flower petals attractive to them. You can trap earwigs and roly polys by setting a trap in your garden each evening. Roll up a sheet of newspaper and set it near your flowers. Pests will crawl in and you can simply collect the tube in the morning and throw it in the trash. Next evening set out a fresh trap. Eventually you'll catch the critters and end the damage to your flowers.
Best wishes with your garden!
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