A stone wall does more than make a clean border along your lawn. It’s a handsome visual statement in itself; a great way to add depth and texture to a flat, featureless yard. It’s practical, too. If you have poor or clay soil, just fill the interior with topsoil and compost and you’ll have a wonderful raised planting bed. It also provides good drainage, making it a great solution for low-lying, soggy gardens. And it’s a good way to terrace a sloped yard and create nice, flat gardens.