Although pleasant to look at, plants have a penchant for stealing humans' precious carbon dioxide and replacing it with oxygen, which most people can get for free anyway. Keep these carbon-thieving crooks within eyesight with today's Groupon: for $10, you get $20 worth of plants at Plant Farm in Spokane Valley.

Plant Farm's full-service garden center sits on 20 sprawling acres of farmland, which yield a cornucopia of flowers and foliage that are sold straight to horti-curious consumers. With more than 100,000 herb plants grown annually, Plant Farm tempts cooks to spicy up pastas and salads with its basil plants ($4.99 for 1-gal.). Grab a fall mum, one of Plant Farm's many rotating perennials, to add a burst of color to drab flowerbeds ($3.69 for 4"). Hardy hibiscuses in an array of colors display resilient fortitude in a wide range of climates, willing to live in sun-kissed gardens or groves ($8.99). Plant Farm also cultivates blooming hydrangeas ($25.99) and hanging foliage ($7.99 for 6").