From Ground: First, water the leatherleaf mahonia plant to dampen the soil. Then, dig a wide trench around the plant using a shovel or spade, ensuring the plant's root ball remains intact. Carefully work the spade under the root ball to lift the plant from its original location.
From Pot: Check if the leatherleaf mahonia plant is root-bound, showing signs of roots circling the pot edges. To remove the plant from the pot, water it well and gently tap the sides of the pot to loosen the soil and the roots. Place one hand over the pot's opening and gently turn the pot upside down so the plant comes out into your hand with the root ball intact.
From Seedling Tray: Water the leatherleaf mahonia seedlings well before attempting to remove them from the tray. Use the trowel to gently loosen the soil around each seedling, taking care not to damage any roots. Use your fingers or the trowel to lift the seedling out gently, holding it by the root ball, not the stem or leaves.