Keep the fern in the same pots they come in, every other day submerge them in a 5 gallon bucket filled with 1/2 cup of epson salts 3 gallons of regular water until the soil stops bubbling, then hang up to drip dry... ferns will be dark green, glossy, and 3x3 by September from ferns that start out with 7 fronds in May.
When the hosta "eyes" appear, I mix one part household ammonia with ten parts of water and pour this mixture around the eyes close to the plant. It doesn't hurt the plants, but it does dissolve the eggs that are laid around the roots. It has reduced the slug population noticeably. I also pour the ammonia solution directly on slugs that I see on the deck. Dissolves them right away.
41 Cheap And Easy Backyard DIYs You Must Do This Summer