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Campanula carpatica: Blue flowers. 1 ft tall mid-late summer.
Campanula glomerata: Indigo blue 1 ft tall spring-mid summer.
Ceratostigma plumbagoides: Pretty, blue flowers in Autumn. 1 ft tall
Coreopsis verticillata: Yellow blooms. 1 ft tall mid-late summer.
Corydalis lutea: Pretty yellow flowers and good foliage. 1 ft Late spring- autumn.