From Ground: Begin by watering the flowering rush plant deeply to make the soil and roots easier to work with. Using a garden fork, gently loosen the soil around the plant. Be careful not to damage the roots. Once the soil is loose, carefully dig around and under the flowering rush plant using a shovel or spade. Try to keep the root ball intact. If the flowering rush plant is large, place it in a wheelbarrow or on a tarp to move it.
From Pot: Water the flowering rush plant well and then turn the pot upside down while holding your hand over the soil surface, cradling the flowering rush plant stem between your fingers. With your other hand, gently tap the bottom of the pot until the plant and its root ball come out. Handle the plant by the root ball, not the stem or leaves, to avoid damage.
From Seedling Tray: Ensure the flowering rush plant is well-watered, then carefully push up from the bottom of the seedling cell. Once the flowering rush plant and its root ball come out, handle it delicately by the root ball.