"tomato craters". I got them from Jung Seeds. They keep the cutworms away from the young plant stalk: This is great information. Cutworms give me trouble every year. Also, your set up and garden looks very neat and tidy. I am also using a similar rainwater-gutter system. I painted my tanks black because I had some issues with algae growth in the tanks. So far, the black paint seems to have eliminated that problem.