If snails plague your favorite plants, try luring them to a distant corner of the garden by cultivating a decoy patch of stinging nettles. Spanish scientists at the University of Santiago de Compostela found that snails in their experimental plots made tracks straight for the nettles, which-despite the prickles--they seem to find tasty. No snails? Plant nettles for the butterflies, who enjoy the flowers. You'll find prickle-free nettles in your local nursery. They make beautiful groundcovers for shade.