Deschampsia cespitosa 'Schottland':
Summer flowering grass with dark green leaves and airy silvery purple flower heads, keep their structure long into winter. Hardy. Up to 1.2m.
Sporobolus heterolepsis (prairie dropseed):
Fine deciduous grass with green foliage in summer turning golden. Graceful flower heads in late summer. Needs sunny spot in well-drained soil. Hardy. Up to 1m.