Carex muskingumensis aka Muskingum Sedge

Carex muskingumensis is palm sedge, a perennial in the sedge family. Its native range runs from eastern Canada into the east-central United States. It grows in wet woods, thickets, and river flood plains. Its name refers to the Muskingum River in Ohio. Gardeners grow this sedge mainly for its leaves and upright form.

Plants form dense clumps with stems clothed in narrow leaves. Garden clumps reach 2–3 feet (0.61–0.91 metres) tall and wide. RHS gives an upper size of 3.3 feet (1 metre). The stiff stems carry green leaves with smooth edges and pointed tips. Leaves reach about 0.67 feet (0.20 metres) long. Those near the stem tops spread out like small palm leaves. RHS describes the plant as semi-evergreen, though its foliage table says evergreen. Rhizomes spread slowly, and plants can also seed themselves.

Small flowers grow in spikes at the stem tips. Their shades range from green and yellow to golden brown. Sources give bloom periods from May through September. Chicago lists May to June; RHS lists June and July. The spikes can remain of interest through summer. Small brown achenes follow and suit dried displays. Birds and small mammals eat them and shelter among the leaves. This sedge also feeds the larvae of some satyrine butterflies.

Palm sedge grows in sun or part shade. RHS favors part shade, while deep shade can cause flopping. Keep the soil moist; rich soil suits it well. It accepts sand, loam, clay, and chalk across a broad pH range. It can grow in shallow water, including submerged containers. Pots and beds away from water need regular watering. Missouri Botanical Garden and Chicago list USDA zones 4–9. RHS rates it H4 for UK conditions. Cut stems back in late winter, or remove dead leaves as needed. Divide clumps or raise new plants from seed.

Use it beside ponds and streams, or in rain gardens. It also suits borders, groundcover plantings, rock gardens, and containers. Its leaves provide the main display where soil stays damp. Sources describe low upkeep and few serious pest or disease problems. Aphids may occur, and deer resistance adds value in gardens. The supplied evidence does not establish human edibility or toxicity.