"If in doubt, plant a geranium". So said gardener and garden writer Margery Fish. There is a Geranium to suit almost any spot be it sun or shade, damp or dry. Geranium macrorrhizum is one of the most versatile. It will grow in full sun, partial shade or full shade, even dry shade. 

 There are several forms with pink flowers but the white flowered G. macrorrhizum 'Album' is my favourite. I saw them planted to good effect under trees in a large bed in central London. Behind them is a drift of Sweet Woodruff (Galium odoratum).