From Ground: First, water the smooth senna 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: Gently tap around the sides and bottom of the pot to loosen the soil. If the plant is root-bound, use a garden fork to gently tease out the roots. Carefully slide the plant out while supporting its base.
From Seedling Tray: Water the seedling tray to moisten the soil. Use a small tool or your fingers to gently loosen the soil around the seedling. Carefully lift the seedling by its leaves, not the stem, to avoid damage.