Cirsium rivulare 'Atropurpureum' (Plume Thistle) in a 7.5cmpo

Cirsium rivulare 'Atropurpureum' is an upright perennial, up to 4 feet (1.2 m) tall, that forms a clump of branching, leafy stems with spherical, deep red flower-heads. Flowers appear from mid-summer to late summer above spiny, dark green leaves.