From Ground: Water the hairy arnica plant to dampen the soil. Using a spade or shovel, dig a wide circumference around the hairy arnica to ensure the root ball is undisturbed. Carefully place the shovel underneath the root ball, and lift the hairy arnica from the ground.
From Pot: Water the hairy arnica to ensure the soil is moist, which makes the removal easier. Grasp the base of the hairy arnica and tilt the pot to gently slide the plant out. Support the root ball with your other hand to avoid any damage.
From Seedling Tray: Moisten the soil in the tray to facilitate easy removal. Use a hand trowel or a dibber to gently lift the seedling by pushing up from the bottom. Hold the seedling by the leaves rather than the stem to avoid injury.