Chain-store nurseries can lack charm. But when we see the display of blooming bougainvilleas and bushy lantanas at Lowe's, we know we've found a green-thumbed friend. You may not find at Lowe's that rare euphorbia you've been looking for (then again, you might), but you will find a sturdy selection of time-honored plants at prices affordable enough to re-create the Hanging Gardens of Babylon in your backyard. And when one of your leafy friends can't hold on for another minute, Lowe's will replace your withered specimen for up to one year. And who could brown-thumb their nose at that guarantee?