From Ground: Start by watering the maryland senna plant to moisten its surrounding soil. This makes digging easier and reduces stress on the plant. Using a shovel, make a wide trench around the plant, being careful to keep the plant's root ball undisturbed. Carefully lower the spade beneath the root ball and lift the plant gently from its original location.
From Pot: Water the plant sufficiently in the pot. Turn the pot sideways, hold the plant gently by its roots, and tap the bottom lightly to slide out the plant and its root ball. If the plant resists, use a garden trowel to lighten the soil around the edges and try again.
From Seedling Tray: Ensure the maryland senna plant has grown enough to handle the transition. Usually, it is safe when the plant has 2-3 sets of true leaves. Gently hold the plant by its leaves (not stem) and use a small tool such as a butter knife to lift the plant from the tray. Be cautious not to damage the root.