Glade Mallow (Napaea dioica) is a robust, coarse herbaceous perennial native to the midwestern United States, where it grows in moist woodland openings and prairie glades from southeastern Minnesota and northeastern Iowa east through Wisconsin, Illinois, Indiana, and Ohio. This uncommon species, listed as apparently secure by the CPC National Collection of Endangered Plants with the Holden Arboretum serving as its primary custodian, typically reaches 24 to 36 inches tall and wide, though some sources report it can grow considerably taller. It thrives in hardiness zones 3 through 8, producing fragrant, showy flowers from June through August that attract butterflies and birds. Dioecious by nature, with male and female flowers on separate plants, Glade Mallow rewards gardeners who plant it in clumps with the bonus of ornamental fruiting on female plants. This low-maintenance perennial tolerates clay soil, drought, and even heavy shade, making it a resilient choice for challenging garden spots.
Partial Sun
Moderate
3-8
96in H x 36in W
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Moderate
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Glade Mallow grows as a dioecious perennial with separate male and female plants, meaning you'll need to grow them in clumps to ensure reliable cross-pollination and fruiting. The fragrant, showy flowers bloom throughout the summer months and attract pollinators reliably, while the equally showy fruit adds visual interest after blooming ends. This Midwestern native is remarkably tough, handling everything from clay and rocky soils to drought and deer pressure without complaint, yet it still performs beautifully in partial shade where many perennials struggle.
Glade Mallow serves as a ground cover in perennial gardens and naturalized settings, particularly where gardeners need a tough, shade-tolerant plant that still produces ornamental flowers and fruit. Its native Midwestern heritage makes it especially valuable for prairie restoration projects, rain gardens, and ecological landscaping that honors regional plant communities.
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“Glade Mallow represents a piece of Midwestern botanical heritage that nearly vanished. This species occurs naturally throughout its native range in scattered woodland glades and prairie openings, but its rarity prompted the CPC (Center for Plant Conservation) to list it as apparently secure and designate the Holden Arboretum in Ohio as the primary custodian of the species. The plant's uncommon status across its native range from Minnesota and Iowa eastward through the Great Lakes states underscores the importance of cultivating it in home gardens, where it serves both as an ornamental and as a living archive of Midwestern ecological diversity.”