From Ground: If the caper bush is currently planted in the ground, water it well before removal to help hold the soil together around the roots. Dig a wide circle around the plant to ensure you include the full root ball. Then carefully work your spade under the plant and lift the root ball out of the ground.
From Pot: Water your caper bush well to dampen the potting soil. It might be helpful to let the pot sit for a moment to let the water saturate. Gently tip the pot sideways and ease the plant out. If you resist, do not pull on the plant, instead, tap on the sides and bottom of the pot to loosen it.
From Seedling Tray: When the caper bush seedlings have true leaves, it's safe for them to be transplanted. To remove seedlings, push from the bottom of the seed cell tray, lift the seedling by leaf gently, not by the stem.