If something smaller is more your cup of tea, try Geranium renardii . This plant forms a neat low mound of grey-white sage textured leaves, and produces large white flowers, boldly veined with violet, in June and July. It does best in a poor and gritty soil, and needs full sun. It is a parent of Geranium Phillipe Vapelle which is a larger growing plant that will grow in any good soil. It produces a mass of large rich purple flowers from May to August.
Many Geraniums make excellent ground cover especially the oxianum types.
My personal favourite is Geranium oxonianum Hollywood . This produces large very pale pink flowers, heavily netted with magenta veins, throughout most of the summer and well into autumn. It is extremely free flowering, with the plant completely hidden by bloom for much of the season. If that sounds too large for your garden, try Geranium oxonianum Lace Time , which we introduced in 1992. It offers the bonus of lemon tinted young foliage in spring, and a very long flowering season.