Mediterranean Bells (Allium siculum).
The Meditrranean Bells have naked stems bearing a crown of bell-shaped flowers that glow green on the outside with striking lilac-pink markings on the inside. When the petals fade the seed heads retain their bold flower shapes long into autumn. This exceptionally tall and handsome plant from the shores of Sicily will add an extra dimension to your cottage garden border.
If you want more information about this flower, just search the plant's Latin (botanical) name on Google: