I always struggled with cabbage worms destroying my cabbage, broccoli, and cauliflower until someone suggested Bt (Bacillus Thuringiensis). It is a natural soil-born bacteria that is toxic to the worms, but harmless to humans. Just sprinkle a little powder on your plants and watch the bugs disappear. You need to re-apply after rain or as needed. This is a 1 lb container of dipel dust (Bacillus Thuringiensis).
Dipel Dust is cold sensitive and is destroyed by freezing. We will be shipping the dipel dust separately after danger of freezing in shipment is past. We expect that this won't happen until late March or April.
I'm sorry, but we can't ship dipel dust to California or Alaska.