Plant Profile: Hibiscus grandiflorus

Swamp Rose Mallow, a member of the Malvaceae family—which includes mallows, cotton, and okra—is a perennial wetland plant that resembles a shrub and is celebrated for its striking flowers. These fragrant blooms can reach up to ten inches in diameter, making them some of the largest flowers found in North America. They open at night, creating a captivating display under the moonlight, and although each flower lasts just a day, new blooms continuously emerge.

This plant is native to the southeastern United States, thriving in environments rich in fresh or brackish water, such as swamps, marshes, ditches, and the peripheries of ponds and rivers. It can grow to heights of ten to fifteen feet and flourishes in warm conditions that encourage the development of buds and flowers. Each winter, the plant dies back to the ground, but it rejuvenates in the spring, producing new stalks with each growing season.

For optimal growth, plant Swamp Rose Mallow in areas that receive full to partial sunlight and in moist to wet soils rich in organic matter, particularly around ponds, streams, swamps, or bogs. It is also suitable for container gardening.