It typically grows in very crowded stands, and may be found in fresh- or saltwater wet areas. S oft rush grows in clumps from short, thick rhizomes. Its pale-green stems are erect and two to five feet tall. Stems are cylindrical and filled with pithy pith. Soft rush has no leaves .
Leafy sheaths wrap the stems at the bottom of the plant.
The inflorescence of soft rush appears to be coming out of the side of the stem. The inflorescence is open and branched. Each branch has many small flowers , each greenish-brown flower on its own stalk. KB Lachnanthes caroliniana Redroot R edroot is an emersed plant. It grows on sandy shores and in the water of ditches, bogs, swamps, lakes, and wet flatwoods.