From Ground: First, water the grey ragwort plant thoroughly to make the soil easier to work with. Then, use a shovel or spade to dig a wide perimeter around the plant, being careful not to damage the root ball. Gently work the tool underneath the root ball and lift the plant out of its current location.
From Pot: Begin by watering the grey ragwort to loosen the soil. Place your hand on top of the soil with the plant's stem between your fingers. Turn the pot upside down and gently tap the bottom and sides until the plant and its root ball come free. If the plant is stubborn, you may need to slide a knife around the inside edge of the pot.
From Seedling Tray: Water the seedlings well, and use a spoon or a small gardening tool to carefully lift the individual grey ragwort plants out of their cells, making sure to support the root ball to avoid damage.