Where to plant
Plant rose mallow in full sun to part shade in marshy areas such as low-lying landscape or at the edge of a pond, lake, or creek. Choose an area where rose mallow's self-seeding nature is acceptable. Otherwise, deadhead blooms to prevent seed development. Rose mallow will die back to the ground in the winter when planted in marshy areas. In drier planting areas, the stems may remain.
Areas where rose mallow grows.
Map courtesy of U. S. Department of Agriculture
Rose mallow propagates well on its own. To expand the planting area, collect the seed pods (also called capsules) when they are dark brown, which happens four to six weeks after the bloom fades. Open the pods to release the seeds. Dry the seeds on a saucer for about a week and then place is a zip top bag to store in the refrigerator. In early spring, cast the seeds in the marshy area.