From Ground: Begin by watering the bladder dock plant to soften the soil. Then use a spade or shovel to dig a generous perimeter around the plant. Be cautious not to damage the root ball, easing the spade underneath it and lift the plant gently.
From Pot: Water the bladder dock to moisten the soil and make the roots less prone to damage. Tilt the pot to the side and tap the bottom to loosen the root ball. Grip the base of the plant and pull it out gently, supporting the root ball with your hand.
From Seedling Tray: Keep the soil damp before attempting to move the seedling. Use a trowel or a similar tool to ease around each bladder dock seedling without disturbing its neighbors. Lift the seedling by the leaves rather than the stem, as the stem is very delicate.