From Ground: Water the cowslip plant lightly to dampen the soil, which will help during the digging up. Use a shovel or spade to dig a wide trench around the plant, ensuring you don't cut through the root system. Carefully work the spade under the root ball to lift the plant from its original location.
From Pot: Water the cowslip plant to make the removal process easier. Gently tip the pot, if the size allows. If the plant is stuck, you may need to tap the edges of the pot to loosen the soil and roots. Pull out the plant with a firm yet gentle grip making sure not to damage the root system.
From Seedling Tray: Water the trays so seedlings slide out more easily. Gently hold the top of the cowslip plant, turn the tray upside-down, and give it a gentle tap until the seedlings slide out.