Salt marsh restoration.  Not a good choice for most landscape uses.

Flowers have yellow tepals but the inflorescence has abundant white hairs which provide an overall white aspect in the landscape. The species is named for its red roots and rhizomes. Feral hogs love this plant and will dig up extensive areas to get the roots.  The plant in turn recovers quickly and new plants come up from the fragmented rhisomes. Groundcover or mass planting in moist areas.