From Ground: Firstly, water the thistle cholla to moisten the surrounding soil. You'll then want to carefully dig a wide perimeter around the plant by using a shovel or spade. Be sure to keep the root ball intact as much as possible. Work the spade under the root ball to help loosen and finally lift the plant from its original location.
From Pot: Start off by watering your thistle cholla to make it easier for the transplant and to minimize stress on the plant. Then, tilt the pot sideways and gently squeeze or tap it to loosen the root ball from the sides of the container. Hold the plant at its base and gently slide out the plant along with its root ball from the pot.
From Seedling Tray: Water the tray to moisten the soil. Carefully lift the thistle cholla by holding its leaves to avoid damaging the stem. Use a gardening trowel if needed to help you lift the plant along with its root ball.