you growing indoors or out? caterpillars are from moths and butterflies. if you are growing indoors, it should be fairly easy to stop in the future. quit leaving the door, window, w/e open, make sure they can't come in your exhaust, attracted by the light.
if you're growing outdoors, you can plant rosemary, peppermint, (^)clove, thyme...probably others, that will deter moths. you can also spray plants pre flower with the oil of any of those, to help repel them, but they all have a strong odor and taste that lasts a long time, if you spray them on buds, you'll have clove or w/e flavored buds. there are wasps that lay eggs on them that hatch out and eat them alive, and praying mantises love them, too. both can be bought online, delivered to your door.
if it gets bad, you can go to something like biothur or spruzit, sprays made from bacillus that work pretty well, but may be a little rough on your plants
