Carex obnupta Large, bushy sedge with evergreen leaves. Blooms in early summer. Spreads by rhizomes. Plant Details Habitat: Riparian Forests Shrub Swamp Shallow Marsh Wet Prairie Mature Height: 2-5 ft. Shade Preference: Soil Tolerance: moist soils to standing water Special Uses: Erosion control. Streambank stabilization. Food and cover for wildlife.