From Ground: Water the northern dock to dampen the soil. Then, use a shovel or spade to dig a wide trench around the plant, taking extra care not to damage the root ball. Gently work the tool under the root ball to lift the northern dock from the ground.
From Pot: Begin by watering the northern dock to ease the removal process. Then, place your hand on the soil surface with the plant stem between your fingers. Turn the pot upside down and tap the bottom to help the northern dock slide out. Support the plant as it comes free from the pot.
From Seedling Tray: Water the seedlings to ensure the soil is moist. Use a spoon or a special seedling transplant tool to gently lift each northern dock seedling from the tray, being sure to include the roots and surrounding soil.