Container grown plants can be set out throughout the growing season, but spring is preferred for fall bloomers. Divide the spring bloomers in midsummer or early fall. Space wood anemones 10 inches apart, snowdrop anemones 12-24 inches apart and fall bloomers 18 inches apart. Prepare the garden bed by using a garden fork or tiller to loosen the soil to a depth of 12 to 15 inches, then mix in a 2- to 4-inch layer of compost. Dig a hole twice the diameter of the pot the plant is in. Carefully remove the plant from its container and place it in the hole so the top of the root ball is level with the soil surface. Carefully fill in around the root ball and firm the soil gently. Water thoroughly.
Divide or move plants in the garden only in the spring. Fall anemones may be slow to establish, but once they are settled in they have a tendency to spread, as do the spring bloomers. Deadheading won't prolong bloom, but will make plants look neater.