I've noticed that there are holes in a couple...

That's just life in the great outdoors bro. But there's a few things you can do : use "companion plants" to keep some pests away, build yourself some sort of protective greenhouse, spray (bio! always bio) repellent on these. Canna makes one that might work for you! Those bite marks are basically from some really tiny insects you can hardly see them but they do love that green.... it's chill man you'll see just don t panic and you'll get a good landing

I coincide with @Larimar, my outdoor plants had same problem, just bugs which eats some nectar and flies away

Looks like slugs/snails to me - they are nocturnal. You can spread egg shells over the top of the soil to help keep them off your plant. I also wrap a couple of bands of copper tape around the outside of the pots, they hate that too. Good luck 👍

Hello @Lumos ! If there are no bugs then i believe it is nothing you should worry about...Maybe the wind or the cold or a bird. Your plant is very healthy. If you don't see an aggressive progression of the problem then don't worry. If you want to be sure give it a preventative spray with pyrethrum . Happy growing ! 👊

these are bites from bugs. Its not so dramatic. You can keep away the bugs with "stinky" flowers. (most of them) like basil geranium, marigold etc,