If I'm planting seeds now should I put anything over them to protect from frost? And what about snails - I thought of putting a salt "perimiter" round thr bed as that worked with the pot plants.Wont/cant use pesticides becasue of the cats Birds, no problem, they hardly ever land in my garden anyway because of the aforementioned cats and if they do stop long enough to eat my seedlings for breakfast, they probably wont be eating lunch...