What A group of shade-loving herbaceous perennials composed of several genera, although Anemone nemorosa is possibly the best known. Origins Woodlands and hedgerows in Europe and North America. Season Spring flowering plants that are dormant during the summer and autumn. Most flower March through to June. Hardiness Tough plants that are hardy throughout all of the UK. Size Most reach a height of between 12cm and 20cm, and can often form clumps that are several metres wide. Conditions Moist but well-drained, humus-rich soil; part shade. Some species will tolerate drier conditions during the dormant period.