I have a small patch of wild grass and flowers. It always surprises me how many insects are thriving of it. Also a big ass kale was growing in there and It was ridden with caterpillars. At first I was worried I might harbor pests for the surrounding farmers but I decided to leave them be. One of them crawled up my walls to cocoon or so I assumed. Now it's a breeding pit of parasitoid wasps and I'm glad I'm providing a real service to the farmers.