That being said, anemones are planted in spring or fall, depending on the type you have. Before planting, soak tubers overnight and then place them in well-draining, fertile soil preferably in a slightly shaded area. Plant anemones about 3 to 4 inches deep, on their sides, and space them about 4 to 6 inches apart. Anemone Flowers Care Once established, care of anemone consists of merely watering as needed and keeping old foliage removed by cutting back to the ground prior to new growth.