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.

Although it has square stems and opposite leaves like members of the mint family (Lamiaceae), this is a member of the daisy family, but it has no ray florets that look like petals. All the florets in the flower head are fertile. Use in a butterfly garden or informal wildflower garden.

Called elephant's foot because of the flat basal leaf formation. Meadows and wildflower gardens.

The author treats this as a friendly weed. Pull them if where there is something more desirable. Back of a wildflower garden in a casual setting. Grown en-masse, this plant can be used as a temporary groundcover.