Cutworms!

Originally Posted by AlittleSalt

That is my soil 100% in the garden. There is always oak leaf matter in different stages of decomposition going on in our gardens. This year, there is green manure in the form of Elbon cereal rye decomposing as well.

Hmm. I wonder how long the cutworms stick around before they all turn into moths.

One thing that might help is removing leaves and stuff a certain distance from your plants, until the threat has passed. I'm not sure how far it would need to be. I don't know if you want to do that, though.