nostr:npub1pncg62q25h704u6qcf56hnmxx46jdlwfpw2t860ld5685s0sjzms9rqlgr those are butterflies, they'll find your brassicas anywhere. It's you or them. One year I picked them all off and killed them; I did have brassica but have regretted killing them ever since 🦋🦋🦋 https://en.m.wikipedia.org/wiki/Pieris_brassicae