well, thats the hard part, all animals, rats, deer, dogs, cats, mice, squirrels you name it, it eats weed, so first you put up some kinda fence, one that can be easily removed,around the plants so no large predators can get to them, you may need to use quite a bit of chicken wire to keep rats out (as they chew it) try to have at least a couple layers, and dig it into the floor good, now youve got to worry about slugs, snails, spider mites and most bugs, so before you plant there, for a good few weeks spray the site with a good bug repellent/killer, try also to keep all plants seperate from other plants with AT LEST a 2 ft gap away from other plants keep spraying your site with crushed garlic in water, use a spray bottle and spray your plants in the evening (when the sun is weak) then, later on, before you go to bud, spray them all with alot of clean water to get rid of garlic residue, REMEMBER NOT TO PUT A WET PLANT INTO SUNLIGHT OR IT WILL BOIL THE WATER OFF DAMAGING THE PLANT! after doing all this your little farm will not be sly in the slightest, so you best keep watch, if thats too much trouble, just plant loads of plants all over the place, and just spend your days gettin stoned with all your plants battling off pests lol - good luck whatever you do man,