I'm trying to garden organically and growing broccoli for the first time this year. Predictably it's full of caterpillars and I've been trying to pick them off when I see them (yuck!). But when I cut some last night to cook it was completely full of them - tiny ones that wouldn't wash off under the tap. In the end I'd almost destroyed it trying to get them all off and to be honest I'd totally gone off eating it! I've resigned broccoli to the caterpillars this year. Has anyone got any ideas how to stop them without using chemicals?