I love growing monarchs and without a greenhouse it's difficult to keep a full supply of milkweed. Until I get my greenhouse I use them to grow milkweed plants (this protects them from butterflies laying more eggs on them). Now I can easily rotate my plants to and from the butterfly cage when I need a full bush to feed the caterpillars. As you can see, 20" x 20" fits a lot. The locks worked great with no problems. The airflow is great too (I live in Florida and it's hot there!), and you can pour them right through the mesh. Overall I think you would love these for any of your butterfly or plant growing needs.
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