Never had toooo much of a problem in my greenhouse. Tis sited on a slabbed area and the paths are all gravel, but of course, slugs and snails sneak in on pots etc....well....today, went to have a pot on session, and what do you know, 8 melon seedlings, gone! :'( Don't they know how much I struggle to get melons to germinate!!?? And right next to them, white acorn squash seedlings, untouched!