Bright flowers, towering reeds, and dramatic foliage are a far remove from what many of us picture when we hear the word bog. But there's no reason this vision can't be a reality. A bog garden—imagine a hybrid of flowerbed and water garden—presents a unique opportunity to grow butterfly flowers, corkscrew rush, and other plants that are happiest when their feet are wet and their legs are dry.
It's easy to recognize potential bog garden sites. Since water runs downhill, look for boggy areas at the base of hills and in natural depressions. These will be the places where the yard never quite dries out and the soil ranges from a bit squishy to downright soggy. The topsoil might appear dry at times, but the root zone should always be moist.
Unlike a rain garden, which is designed to handle brief inundations after a downpour but then drain to nearly dry, a bog garden is best suited to a water-retentive site that will always (or nearly always) be wet. Standing water is not necessary, but many bog plants will not thrive unless their roots have access to near-constant moisture. Set bog plants directly into the ground. Or plant into sunken terra-cotta pots, which allow moisture to reach the roots but keep aggressive spreaders in check and make it easier to relocate tender perennials to warmer winter quarters.
Try several of the plants described here—or experiment with other bog-loving plants, often sold as marginal plants for water gardens—and watch as a once-avoided area of muck and mud becomes a garden to admire and enjoy.
Start with Structure
Every landscape needs vertical structure, whether tall and towering or short and spikey. Plants in the Cyperus genus offer excellent structure for boggy areas. Umbrella palm (C. alternifolius) stands 4 to 6 feet tall and carries an "umbrella" of narrow leaves that can reach 2 feet in diameter. Papyrus (C. papyrus) stands even taller–5 to 12 feet-while dwarf papyrus (C. isocladus) barely exceeds 12 inches. Most Cyperus species are tropical perennials and will overwinter in USDA Plant Hardiness Zones 8 to 11, but umbrella palm tolerates Zone 7. In colder climates, bring plants indoors in winter.