The Drunken Botanist: The Plants that Create the World's Great Drinks, by Amy Stewart

The Drunken Botanist works through the plants behind spirits, beer, wine and cocktails, some familiar, some obscure, a few genuinely strange. Stewart brings in biology, chemistry, history and mixology without making any of it feel like homework. With more than fifty drink recipes and growing tips for gardeners, it will make you the most popular guest at any cocktail party.