Astilbe chinensis ‘Purpurkerz’ (Chinese astilbe ‘Purple Candle’)

Astilbe chinensis var. taquetii ‘Purpurlanze’ (Chinese astilbe ‘Purple Lance’)

Baptisia ‘Purple Smoke’ (false indigo ‘Purple Smoke’)

Calamintha nepeta subsp. nepeta (calamint)

Callirhoe involucrata (purple poppy mallow)

clustered bellflower ‘Caroline’

Chionodoxa forbesii ‘Blue Giant’ (glory of the snow ‘Blue Giant’)

Chionodoxa luciliae ‘Violet Beauty’ (glory of the snow ‘Violet Beauty’)

Chionodoxa sardensis (Turkish glory of the snow)

Clematis integrifolia (solitary clematis)