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Aster alpinus 'Dunkle Schöne'

Aster laeve 'Arcturus'

Aster n.a 'Barr's Blue'

Aster n.b 'Climax'

Aster n.b 'Davey's True Blue'

Aster tongoliensis 'Wartburgstern'

Baptisia australis

Baptisia australis var.minor

Ceratostigma willmottianum

Eryngium planum 'Blue Hobbit'

Hemerocallis 'American Revolution'

Nepeta manchuriensis 'Manchu Blue'

Nepeta racemosa 'Superba'

Nepeta racemosa 'Walker's Low'

Nepeta sibirica

Nepeta x faassenii 'Purrsian Blue'

Phlox paniculata 'Blue Evening'

Rosmarinus officinalis 'Boule'

Salvia chamaedryoïdes var.isochroma

Vendangeuse - Aster 'Little Carlow'

Veronica austriaca subsp.teucrium 'Kapitän'

Veronica austriaca subsp.teucrium 'Royal Blue'

Veronica spicata 'Blue Shades'

Veronicastrum sibiricum