Anemonoides quinquefolia is a perennial herbaceous plant with a horizontal underground rhizome 1–3 mm (0.04–0.12 in) thick. There are two distinct leaf forms: stem leaves and a basal leaf. The flowering stem (which includes the stem leaves) and the basal leaf emanate from the same base point on the rhizome.
This member of the buttercup family is a woodland plant that performs best in full or partial shade, such as the dappled light beneath a deciduous tree.
Wood anemone requires rich, loose soil and benefits from the addition of 2 to 3 inches (5 to 7.5 cm.) of compost, leaf mulch, or bark chips to the soil before planting.
Anemones are frost hardy to -10c but flower spikes will be damaged if frozen (in the UK even Autumn started corms won't flower until April when temperatures have usually recovered) If you are in any doubt sow in the Spring.
Yes, Anemone coronaria do very well in pots. Anemone nemorosa and anemone blanda can be grown in pots but are happier in the ground.
The toxicity of Anemone nemorosa is very high. ... In internal use it is very toxic, acting as a narcotic and being able to cause muscular paralysis and heart failure.