From Pot: First, water the greater pond-sedge plant to make the soil more manageable. Then, gently turn the pot sideways, holding the plant's stem or bottom leaves. If possible, avoid touching the stem or foliage. Tap the bottom and sides of the pot to loosen the root ball. If the plant is stubborn, slide a knife around the inside of the pot to free the roots. Once loose, you should be able to carefully slide your greater pond-sedge plant out of its pot.
From Ground: Begin by watering the greater pond-sedge plant to soften the ground. Use your shovel to dig a wide circle around the greater pond-sedge plant, taking care not to damage the roots. Dig deep enough to get under the root ball and then carefully lift the greater pond-sedge plant out of the ground.
From Seedling Tray: Start by filling a watering can with lukewarm water and moisten the seedlings. Then carefully loosen the soil around the greater pond-sedge using a small gardening fork or a popsicle stick. Gently lift the greater pond-sedge plant from the tray by holding it by a leaf, never by the stem. If it resists, continue to loosen the earth until it's free from the tray.