Asperula gussonii

Frosted hard dome topped with long tubular pink flowers.is a cushiony, like the other Asperula on the list but its curly leaves which throw the light and hence the frosted appearance.  Another hardy cookie perfect for neglected trough and cracks in crevice garden. Tough enough to be an exciting, albeit small, addition to the rock garden.

Thanks to www.holzbecher.cz Holzbecher nursery for the image.