From Ground: Begin by watering the alpine aster plant to make the soil damp. This eases the task of digging and reduces stress on the plant. Using a shovel or spade, dig a wide circle around the plant keeping a safe distance from the base to ensure you don’t injure the roots. Dig deeply enough to include the plant's root ball. Carefully, begin to lift the plant ensuring that it remains intact.
From Pot: Before removal, water the potted alpine aster enough so the soil is moist. Turn the pot sideways, and gently tap its edges, or give the base a soft thump to dislodge the plant. Support the plant at the base to avoid breakage and gently slide the plant out. Try not to pull on the plant, rather let it slide out naturally.
From Seedling Tray: Make sure the alpine aster seedling tray has been watered, then gently remove the seedling by pushing it up from the bottom. Be sure to handle them by the leaves, not by the stem. If the seedlings have developed a fair number of roots, they may hold the soil together, making it easier to remove.
