From Ground: Start by deep watering the black iris plant a day prior to uprooting, making the soil relatively easier to work with and lessening plant stress. Using the shovel or garden spade, dig a generous hole around the plant, preserving a safe margin around the plant to avoid disturbing the root ball. Carefully wedge the spade underneath the root ball and gently elevate the entire plant from its position.
From Pot: Thoroughly water the pot and let it drain. Turn the pot sideways or upside down, placing one hand on the soil surface with the black iris plant stem between your fingers. Tap the pot's rim on a hard surface, which should free the plant and soil together. If it's difficult, run a blunt knife or trowel around the inside of the pot to loosen.
From Seedling Tray: Begin by watering the tray. Using a trowel or a similar tool, gently make an indent underneath the seedling and lift it carefully, making sure to keep the roots as undisturbed as possible.