DIG THIS!   about Broccoli:

You can thwart cabbage loopers on your cabbage family crops by making a newspaper collar.  Wrap several wet layers of newspaper around the stem of your transplant, making sure to have the paper 2-3 inches above the soil and 2 inches below the soil level.  This works for any plant that cutworms are attracted to in the garden.  Broccoli and cauliflower are the only vegetables that are also flowers!  California produces almost all of the broccoli in the United States.