From Ground: Water the thread rush deeply a day before the planned relocation to dampen the soil and reduce stress on the plant. Dig around the plant with a shovel or spade to create enough space to lift out the root ball without damaging it. Gently work the tool under the root ball and lift it with soil adhering to the roots.
From Pot: Water the thread rush to help the root ball stay together during the transition. Tip the pot sideways and gently tap it to encourage the plant and its root ball to slide out. Support the plant by the base as you remove it.
From Seedling Tray: Water the seedlings well before transplanting. Carefully loosen the soil around the desired thread rush with a small tool or your fingers. Gently extract the seedling by lifting it from the base to avoid damaging the delicate roots.