| Buddleia davidii 'Bicolor' |
| Buddleia davidii 'Black Knight' |
| Buddleia davidii 'Honeycomb' |
| Buddleia davidii 'Nanho Blue' |
| Buddleia davidii 'Nanho Purple' |
| Buddleia davidii 'Peacock' |
| Buddleia davidii 'Petit Purple' |
| Buddleia davidii 'Pink Delight' |
| Buddleia davidii 'Potters Purple' |
| Buddleia davidii 'Purple Emperor' |
| Buddleia davidii 'Raspberry Wine' |
| Buddleia davidii 'White Ball' |
| Buddleia davidii 'White Profusion' |
| Bupthalmum salicifolium |
| Calamintha grandiflora 'Variegata' |
| Calamintha nepeta 'White Cloud' |
| Campanula carpatica 'Blue Clips' |
| Campanula carpatica 'China Doll' |
| Campanula carpatica 'Pearl Deep Blue' |
| Campanula carpatica 'White Clips' |
| Campanula cochleariifolia 'Bavaria Blue' |
| Campanula glomerata 'Caroline' |
| Campanula glomerata 'Kent Belle' |
| Campanula glomerata 'Superba' |
| Campanula lactiflora 'Pouffe' |
| Campanula lactiflora 'Prichards Variety' |
| Campanula lactiflora 'White Pouffe' |
| Campanula persicifolia 'Blue' |
| Campanula persicifolia 'Telham Beauty' |
| Campanula portenschlagania 'Aurea' |
| Campanula portenschlagiana 'Birch Hybrid' |
| Campanula portenschlagiana 'Resholt' |
| Campanula poscharskyana 'Blue Waterfalls' |
| Campanula poscharskyana 'E.H. Frost' |
| Campanula punctata 'Bowl of Cherries' |
| Campanula punctata 'Cherry Bells' |
| Campanula 'Purple Sensation' |
| Campanula rotundifolia ' Thumbell Blue' |
| Campanula rotundifolia 'Olympica' |
| Campanula 'Sarastro' |
| Campanula takesimana 'Elizabeth' |
| Campanula trachelium 'Bernice' |
| Campanula 'White Pearl' |
| Canna 'Bengal Tiger' |
| Canna 'Black Knight' |
| Canna 'Cleopatra' |
| Canna 'Delibab' |
| Canna 'Inferno' |
| Canna 'Lucifer' |
| Canna 'Red King Humbert' |
| Canna 'Semaphore' |
| Canna 'Stuttgart' |
| Canna 'The President' |
| Catananche caerulea |
| Centaurea dealbata |
| Centaurea dealbata 'Rosea' |
| Centaurea montana 'Blue' |
| Centaurea montana 'Gold Bullion' |
| Centaurea montana 'Purple Heart' |
| Centaurea suaveolens |
| Centranthus ruber |
| Centranthus ruber 'Albus' |
| Centranthus ruber 'Coccineus' |
| Cerastium tomentosum 'Snow in the Summer' |
| Cerastium tomentosum 'Yo Yo' |
| Ceratostigma plumbagnoides |
| Chelone glabra |
| Chelone lyonii 'Hot Lips' |
| Chelone obliqua 'Alba' |
| Chelone oblique |
| Chelone oblique 'Rosea' |
| Chelonopsis yagiharana |
| Chrysanthemum coccineum |
| Chrysanthemum nipponicum |
| Chrysogonum virginianum 'Allen Bush' |
| Cimicifuga acerina |
| Cimicifuga racemosa |
| Cimicifuga racemosa 'Atropurpurea' |
| Cimicifuga racemosa 'Brunette' |
| Cimicifuga racemosa 'James Compton' |
| Cimicifuga racemosa 'Pink Spike' |
| Cimicifuga racemosa var. cordifolia |
| Cimicifuga racemose var. 'Cordifolia' |
| Cimicifuga simplex 'White Pearl' |
| Cimicifuga simplex 'Hillside Black Beauty' |
| Commelina 'Electric Blue' |
| Convallaria majalis |
| Convallaria majalis 'Bordeaux' |
| Convallaria majalis 'Rosea' |
| Coreopsis alpins 'Alba" |
| Coreopsis auriculata 'Zamfir' (zone 3-9) |
| Coreopsis 'Crème Brulee' |
| Coreopsis 'Full Moon' |
| Coreopsis grandiflora ' Early Sunrise' |
| Coreopsis grandiflora 'Flying Saucers' |
| Coreopsis grandiflora 'Rising Sun' |
| Coreopsis 'Jethro Tull' |
| Coreopsis lanceolata 'Sterntaler' |
| Coreopsis 'Limerock Passion' |
| Coreopsis pub. 'Sunshine Superman' |
| Coreopsis rosea |
| Coreopsis rosea 'American Dream' |
| Coreopsis rosea 'Heaven's Gate' |
| Coreopsis rosea 'Sweet Dreams' |
| Coreopsis 'Tequila Sunrise' |
| Coreopsis verticillata 'Moonbeam' |
| Coreopsis 'Zagreb' |
| Coreopsis 'Zamfir' |
| Corydalis elata |
| Corydalis lutea |
| Corydalis quant. 'Chocolate Star' |
| Corydalis x 'Blackberry Wine' |
| Cotula minor |
| Crocosmia 'Constance' |
| Crocosmia 'Emberglow' |
| Crocosmia 'Emily McKenzie' |
| Crocosmia 'General Davidson' |
| Crocosmia 'Lucifer' |
| Crocosmia masoniorum |
| Cymbalaria muralis |