Napaea dioica, commonly known as Glade Mallow, is a tall perennial herbaceous plant native to alluvial floodplain meadows and moist prairies in the central and eastern United States, particularly along the Mississippi River and its tributaries across east-central Ohio, central Indiana, northern Illinois, southwestern Wisconsin, southeastern Minnesota, and northeastern Iowa. It typically grows 5-10 feet tall and features large, coarse leaves that can be up to 30 inches long. Glade Mallow produces clusters of white flowers that are organized in a panicle and bloom for 4-5 weeks in late June. The flowers open in the morning and are quite showy, making them attractive to pollinators. Being dioecious, it has separate male and female plants.

Glade Mallow is valued for its ability to thrive in moist soils and its use in naturalistic plantings, such as rain gardens and wildlife habitats, where it provides cover and food for various species. It prefers full sun to part shade and requires consistently moist soil, making it suitable for areas that are not well-drained. While it is not commonly used in small residential gardens due to its size, it is an excellent choice for restoration projects and larger landscape settings. Gardeners should be aware that it can spread by rhizomes and may require space to accommodate its growth.CC BY-SA 4.0