Are you sure they aren't budworms? I think they love petunias and calibrachoas. You might want to look into spraying with thuricide. Here's a video by one of my favorite youtubers who has a lot of good advice on pest control.

https://www.youtube.com/watch?v=I7ocpczQva8

Oh, interesting! I could have budworms, too. But I have slime trails, so slugs are definitely part of the problem.

Get yourself some Sluggo or equivalent brand. It's organic and kills snails and slugs, but is safe to use around pets and wildlife. So easy... I finally got some two years ago and now regret all the previous years of wasted time and plants, and slime on me from fighting snails and slugs. :p

I agree party_music50! I spent years letting slugs decimate my hostas. Now I use sluggo (or an equivalent brand). And while it doesn't eliminate them, it definitely reduces them and I actually get to see my hostas!