Ask Gardenerd: Green Worms on My Brassicas
We get questions like this one from Jody all the time: "Last year I ripped everything out of my garden, put fresh soil in and decided rather last minute to do an edible landscape. It was beyond anything I could have expected or hoped for, but what really was trouble was the white butterflies infesting/laying eggs/green worms in my cabbage, broccoli and kale.