Aconitum
Agastache ‘Blue Fortune’
Agastache ‘Golden Jubilee’
Ajuga
Amsonia ‘Blue Ice’
Amsonia hubrichtii
Aquilegia ‘Pumila’
Aster ‘Wood’s Blue’
Baptisia australis
Baptisia ‘Purple Smoke’
Brunnera
Buddleia ‘Black Knight’
Calamintha ‘Blue Cloud’
Campanula ‘Blue Uniform’
Campanula ‘Blue Waterfall’
Campanula ‘Dickson’s Gold’
Caryopteris
Centaurea
Ceratostigma plumbaginoides
Clematis ‘Mrs. Thompson’
Clematis ‘Multi Blue’
Clematis ‘Polish Spirit’
Clematis ‘The President’
Corydalis elata
Geranium ‘Brookside’
Geranium ‘Dilys’
Geranium ‘Orion’
Geranium ‘Rozanne’
Iris cris. ‘Powder Blue Giant’
Iris ens.’Velvet Queen’
Iris lous. ‘Black Gamecock’
Iris sib. ‘Ceasar’s Brother’
Iris sib.’Royal Blue’
Isotoma
Lithodora
Lobelia siphilitica
Mazus reptans
Mertensia
Passiflora ‘Waterloo Blue’
Perovskia
Phlox div. ‘London Grove Blue’
Phlox stol.. ‘Blue Ridge’
Phlox sub. ‘Emerald Blue’
Platycodon ‘Sentimental Blue’
Polemonium
Pulmonaria ‘E.B. Anderson’
Pulmonaria ‘Majeste’
Pulmonaria ‘Silver Shimmer’
Pulmonaria ‘Spilled Milk’
Salvia ‘Blue Hill’
Sisyrinchium
Stokesia ‘Blue Danube’
Tradescantia ‘Sweet Kate’
Verbena ‘Blue Princess’
Veronica ‘Georgia Blue’
Verocnia ‘Royal Candles’
Veronca ‘Sunny Border Blue’
Vinca minor