Without plants 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 $10, you get $20 worth of plants and gardening supplies at English Gardens, redeemable at all seven Southeastern Michigan locations in the Detroit area.

English Gardens, established in 1954, adorns backyards and bouquets alike with its nursery, florist, landscaping center, and array of seasonal supplies. Petal purveyors guide gardeners through a fragrant menagerie of potted plants, helping shoppers find adornments ideal for their garden's soil type, sun exposure, or volcano-rim location. Infuse flowerbeds with the vibrant colors and nose-tickling aromas of impatiens ($6.99+), flowering shrubs ($22.49+), and rose plants ($19.49+), or forage an orchard's worth of fruit and berry plants ($22.49+) for edible greenery. A vast collection of gardening tools and soil-nourishing fertilizers keep leaves lavish and trees growing strong, and the florist's daily arrivals of exotic blooms ensure that every bouquet, garland, and boutonniere is fresh and fragrant.