From Ground: Begin by watering the tall blue lettuce plant to moisten the soil, making it easier to remove. Dig a wide circle around the plant using a garden spade or shovel to avoid damaging the root system. Gently pry under the root ball with your tool and lift the plant from the ground.
From Pot: Water the tall blue lettuce thoroughly. Turn the pot sideways, tap the bottom, or gently press on the sides to loosen the plant. Grasp the base of the plant and ease it out, supporting the root ball to prevent it from breaking apart.
From Seedling Tray: Water the seedlings to ensure the roots are pliable. Use a trowel or your fingers to carefully loosen the soil around the desired seedling. Gently lift the seedling by its leaves, not the delicate stem, to remove it from the tray.