Grows well well north of its native range.  Documented in very southern counties with an outlier in Martin County -- that outlier is also unique in that it was collected near a cypress dome. Closely related to corn, this species has been crossed with maize to produce a corn that is resistant to Helminthosporium turcicum, the fungus that causes northern leaf blight  (Wikipedia). Listed as Threatened in Florida. Informal borders.

Informal shady semi-shady gardens.

Natural areas with some trees and vines for support

In a managed garden, gamagrass can be trimmed back at the end of winter. Hedge, foundation planting, individual large grass clump, background screen for a flower garden. Rain garden or bioswale.

Used extensively in Indian cultures. Fruits are very high in Vitamin C. Casual settings, wetland edge or screen plant. Rain gardens and bioswales. Long bloom period.