Decorative ornamental grass! That's the sedge 'Prairie Fire' (Carex testacea). We are mad about this plant. This low-growing sedge blooms with stunning brown plumes. Combined with the way it grows upright, this plant steals the show in our garden. We can plant this plant all year round. Provided temperatures don't go below freezing. The plant flowers in the summer.
The plant does not require pruning. Just cut away the dead leaves. Put the sedge somewhere in the sun. Water the plant regularly. The plant thrives in slightly moist soil.