Silene regia

An amazing tall upright N.American species with big, intense red flowers over a long period. 

Hardy and long-lived
sold out for now

Silene zawadskii

If you have ever admired the fresh white blooms of the white campion but wished it wasn't quite so weedy this might be the answer. This 'alpine' version is very neat and adaptable.
3in square pots ~ £5

Silene asterias

Silene asterias, originally uploaded by peganum.

A lovely little Bulgarian species unlike any of the other Silene in cultivation that I'm aware of. This has tiny flowers massed into thrift-like heads well above the rosettes of fresh green leaves.
The combination of vivid pink (what colour is that? carmine?) flowers in dark wine red bracts and the violet anthers is extremely striking. The foliage is good too.
In cultivation it is an easy and adaptable species suitable for any moisture retentive soil but is particularly useful for wet sites where something smaller is required.
1L pots ~ £7