Christmas Fern (Polystichum acrostichoides) is a groundcover with dark green fronds up to 2 feet long. They prefer mesic to dry soil in part sun to shade. Colonies typically form as the plants mature, which makes them a good choice for groundcovers on shaded slopes and banks. The foliage is semi-evergreen, adding winter interest. Companion plants include Pennsylvania Sedge (Carex pensylvanica) and Woodland Phlox (Phlox divaricata).
In wetter soils, plant the rhizome at an angle to prevent crown rot from developing.