Swamp Rose-Mallow

 

Hibiscus moscheutos

The common marshmallow plant is a green perennial that grows large, bee-pollinated, white flowers from July to September, followed by seedpods that ripen from August to October. The plant is hardy in U.S. Agriculture Department hardiness zones 3 through 9, where it grows wild in sunny but cool places on the edges of marshland and on grassy banks along lakes and other bodies of water.