Scarlet rose mallow is a plant of bold scale and bold color. It comes from the marshes and swamps of Alabama, Georgia, and Florida, and it brings that wetland amplitude into the garden — growing six to eight feet tall and producing flowers up to six inches wide in a red so saturated it stops the eye. The large, angular leaves compound the effect, giving the whole plant a presence more architectural than most herbaceous perennials can manage. Hummingbirds, butterflies, and pollinators all find it compelling, and native bees nest in the hollow dead stems.

For this reason, gardeners are encouraged to cut back spent stems only to twelve or twenty-four inches and leave them standing until they break down naturally. Plant it in full sun to part shade in moist, occasionally wet soil — beside a pond, along a stream edge, or in a rain garden where it can drink freely. It suits the rear of the perennial border, though taller stems may need staking in exposed positions. Pruning is fine, but flowers appear only on new growth.