Herbal cocktails have evolved beyond the mojito. Why should the garden be any different? All across town, smart bartenders are mixing sophisticated summer elixirs with leaves, flowers, berries and buds of locally grown flora. Since you, savvy gardener/drinker, already have the mint-and-basil basics mastered, we thought we’d help you diversify your imbibe-able herb portfolio. Muddle 'em. Steep 'em. Soak 'em in gin or freeze 'em in ice. These 18 plants will keep you (and your drink) refreshed all summer long.