Sanguisorba officinalis Arnhem
is tall and see-through so that you can peer out from behind a clump as if looking through a gauzy curtain. It likes difficult clay soils and spreads surely but not in a thuggish manner. It doesn't need staking and adds colour through late summer into autumn with blood red flower-heads. In this border it is planted with Knautia macedonica, Scabiosa ochroleuca
and Anemanthele lessoniana
. Also good with the larger grasses.