From Ground: Begin by watering the rusty foxglove plant until the surrounding soil becomes damp, but not waterlogged. Using a garden fork, gently loosen the soil around the periphery of the rusty foxglove. Dig a wide trench around the plant using a shovel, careful not to disturb the root ball. Once a sufficient trench is created, slide the spade underneath the root ball and lift the plant cautiously.
From Pot: Water the rusty foxglove generously to ease the removal. Turn the pot sideways, while keeping one hand on the soil and the other on the rim of the pot. If the plant isn't coming out easily, tap lightly on the pot's sides or bottom to loosen it.
From Seedling Tray: Make sure the rusty foxglove seedling is well hydrated before transplanting. Gently separate the seedling from the others, and with a small tool or your finger, push up from the bottom of the tray to remove the seedling, taking care not to damage the roots.