Persicaria runcinata 'Purple Fantasy':
Attractive foliage perennial with triangular leaves with V shaped dark purple marks. Loose spikes of pink/white flowers in summer. Hardy. Up to 60cm.
Sanguisorba 'Tanna' (Burnet 'Tanna'):
Spikes of burgundy-red bobbly flowers appear in late summer over crinkled blue-green leaves. Height to 50cm. Hardy.