From Ground: Water the water sedge plant to dampen the soil. Then, using your garden shovel or spade, dig a generous trench around the plant, careful to avoid damaging the root system. Gently work the shovel beneath the root ball and lift the water sedge from its original spot.
From Pot: Before removing the water sedge from the pot, ensure the soil is moist. Tip the pot sideways and tap the edges to loosen the root ball. Gently pull the water sedge from the pot while supporting the base of the plant and roots.
From Seedling Tray: Water the soil in the tray to soften it. Use a garden fork or a small spade to lever the water sedge seedlings gently out of their cells, trying to keep as much soil around the roots as possible.