From Ground: First, water the cat greenbrier plant to moisten the soil, which makes it easier to dig. Then, use a shovel to dig a wide trench around the plant, ensuring the root ball remains intact. Once that's complete, carefully work the spade under the root ball to lift the plant from its location.
From Pot: Start by watering the cat greenbrier plant in its pot, which will make removal more manageable. Invert the pot, gently tap its bottom to eject the plant. If it's hard to remove, use a trowel to loosen the soil around the edge. Handle the plant by its root ball to avoid damaging the stem or leaves.
From Seedling Tray: Fill the hole in the ground with water and place the cat greenbrier seedling into the hole. With extreme care, remove the seedling from the tray by pushing it up from the bottom. Try to hold the leaves, not the stem, as they are stronger.