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Black sedge develops evergreen tufts of dark blue-green to grayish foliage with a whitish underside. Spreads by runners. Produces black flowers and seed heads that look nice but are not prominent. Plant in moist soil, tolerates full sun as long as soil is wet, and can grow in 3-4 inches of standing water. Water well after planting; maintain 1" of water, once a week the first year. Use slow release fertilizer in spring or at planting. Mulch 1-2" to suppress weeds and retain soil moisture. In general, cut ornamental grasses down as low as possible in late winter.