From Ground: First, water the dahlia 'Henriette' plant to dampen the soil. Then, dig a wide trench around the plant using a shovel or spade, ensuring the plant's root ball remains intact. Carefully work the spade under the root ball to lift the plant from its original location.
From Pot: Water the dahlia 'Henriette' thoroughly to help loosen the soil. Gently turn the pot on its side and tap it to release the plant. If necessary, use a trowel to ease the plant from the pot, ensuring the root ball stays intact.
From Seedling Tray: Water the seedlings to help loosen the soil. Gently squeeze and lift the seedlings from the tray, taking care to handle them by the leaves and not the stems to prevent damage.