Without trees to generate oxygen, humans would have to retrieve it from scuba tanks and the minty breath of local supermen. Keep the air alive with today's Groupon: for $12, you get $25 worth of plants and garden supplies at Buchwalter Greenhouse in Wooster.

For 85 years, Buchwalter Greenhouse has tended its namesake's green-thumbed family tree, expanding in size, as well as in the variety of plants and gardening supplies available. Today, thousands of square feet host a veritable jungle of flora, including a tented outdoor area for trees, shrubs, and perennials ($6.99 for one 8" annual, $22 for four) abutting a shimmering glass-walled greenhouse that overlooks a pond. Buchwalter transforms clients' personal ponds into watery oases with pond liners and pumps, fish and fish food ($5.95+), and mermaid eggs. Flowers ($13.95+ for hanging baskets), vegetables, and houseplants sprout alongside complimentary services, such as repotting and on-site planting. Bring failing flora to Buchwalter's experts, who can identify gardening problems free of charge by examining customers' plant samples or police plant sketches.