The greenhouse effect

With a total growing area of more than 54,000 square feet, Denver's greenhouses produce most of the annuals that grace one of the nation's largest municipal park systems. Photo: Stan Obert, Denver Metro Convention and Visitors Bureau

Starting from cuttings or seed, staff at Mobile, Ala.'s greenhouses and nurseries grow a variety of trees, shrubs, and plants. Photo: Dan Otto

Although Wichita, Kan.'s greenhouse stopped propagating plants in the early 1990s, it's still used to house greenery before planting time. Photo: Thane Rogers

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