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'Rocky Diamond Blue' is a compact, mound-forming, deciduous perennial with glossy, lance-shaped, dark green leaves and, in autumn, upright, short-stemmed, trumpet-shaped, blue flowers with lightly spotted, creamy-white throats.
Grow in humus-rich, moist but well-drained, neutral to acid soil. Plant in sun in areas with cool and damp summers, in partial shade elsewhere.