Cornus canadensis (creeping dogwood):
Ground cover plant with white four petalled flowers in spring. Leaves turn brilliant red in autumn. Ideal under deciduous trees
Mukdenia rossii:
Short plump spikes of white flowers in spring, but mainly grown for its foliage which turns brilliant red in autumn. Up to 30cm.
Pachyphragma macrophyllum:
Great for ground cover in shady areas,glossy round, green leaves and clusters of white flowers in the spring. Hardy. Up to 45cm.