Spread the tarp on the soil near the growing area. You will place the extricated leopard plants on the tarp temporarily while you divide them.
Insert the tip of the shovel into the soil about 6 inches away from the outside edge of the leopard plant. Push the shovel into the soil as deeply as possible and then remove it. Reposition the tip of the shovel on the soil and push it down deeply again. Continue loosening the plant with the shovel around the entire perimeter.
Push the shovel under the roots to lift the plant out of the soil after you finish loosening it. Transfer the plant to the tarp.
Remove as much soil as possible from the roots by shaking the plant gently. Cut away any dead growth with the pruning shears.
Cut the root system into pieces to divide it. Push the knife carefully through the leopard plant down from the crown and into the roots. Leave at least one bud in each root division.
Replant the divided giant leopard plant, spacing the new plants about 3 feet apart and placing them in the soil at the same depth as the original plant was growing. Firm the soil gently around the plant crowns.