From Ground: Start by watering the hoary alyssum plant to moisten the soil. This makes it easier to remove without damaging the roots. Proceed to dig a circle around the plant using your shovel, making sure you a go a few inches deep to avoid harming the root ball. Gently lever the plant out of the ground with the spade.
From Pot: Water the hoary alyssum plant well to loosen the soil. Turn the pot sideways, hold the plant gently by its base, and tap the bottom of its pot until the plant slides out.
From Seedling Tray: Water the seedlings and then carefully separate them by gently pulling them apart. Be sure to handle the hoary alyssum seedlings by their leaves to prevent damage to the stem or root system.