From Ground: First, water the dahlia 'Lady Kate' 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 'Lady Kate' plant thoroughly, then gently tap the sides of the pot to loosen the soil. Carefully turn the pot upside down while supporting the base of the plant with your hand. Slide the plant out, being cautious not to damage the roots.
From Seedling Tray: Water the dahlia 'Lady Kate' seedlings beforehand. Gently use a trowel or your fingers to loosen the soil around each seedling. Carefully lift the seedlings from the tray by their leaves or the base of the stem, ensuring the roots remain intact.