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Calamagrostis brachytricha AGM
Calamagrostis varia
Calamagrostis x acutiflora 'Karl Foerster'
Calamagrostis x acutiflora 'Overdam' (v)
Calamintha grandiflora
Calamintha nepeta
Calceolaria biflora 'Goldcap'
Calceolaria fothergillii
Camassia leichtlinii subsp. leichtlinii AGM
Camassia leichtlinii subsp. suksdorfii Caerulea Group
Campanula alliariifolia
Campanula 'Burghaltii' AGM
Campanula cochlearifolia 'Bavaria Blue'
Campanula cochlearifolia 'Elizabeth Oliver' (d)
Campanula garganica 'Dickson's Gold'
Campanula garganica 'Mrs Resholt'
Campanula glomerata var. alba
Campanula glomerata var. alba 'Schneekrone'
Campanula glomerata var. dahurica
Campanula 'Kent Belle' AGM
Campanula lactiflora 'Loddon Anna' AGM
Campanula lactiflora 'Pouffe'
Campanula lactiflora 'Prichard's Variety' AGM
Campanula lactiflora white-flowered
Campanula latiloba 'Hidcote Amethyst' AGM
Campanula latiloba 'Highcliffe Variety' AGM
Campanula makaschvilii
Campanula persicifolia 'Blue Bloomers' (d)
Campanula persicifolia 'Chettle Charm' (PBR) AGM
Campanula persicifolia 'Gawen'
Campanula persicifolia 'Grandiflora'
Campanula persicifolia 'Grandiflora Alba'
Campanula persicifolia 'Powder Puff' (d)
Campanula persicifolia 'Telham Beauty' misapplied
Campanula persicifolia var. alba
Campanula 'Pink Octopus'
Campanula portenschlagiana 'Resholdt's Variety'
Campanula punctata f. rubriflora
Campanula punctata 'Pantaloons' (d)
Campanula punctata 'Reifrock'
Campanula punctata var. hondoensis 'Bossy Boots'
Campanula 'Samantha'
Campanula 'Sarastro'
Campanula sarmatica
Campanula 'Summer Pearl'
Campanula takesimana
Campanula takesimana 'Elizabeth'
Campanula trachelium 'Bernice' (d)
Campanula x haylodgensis 'Yvonne'
Canna indica 'Purpurea'
Canna 'Orange Perfection'
Cardamine glanduligera
Cardamine quinquefolia
Carex brunnea 'Jenneke' (v)
Carex comans 'Frosted Curls'
Carex elata 'Aurea' (v) AGM
Carex flagellifera
Carex oshimensis 'Evergold' (v) AGM
Carex testacea
Catananche caerulea
Catananche caerulea 'Alba'
Centaurea atropurpurea
Centaurea dealbata
Centaurea 'John Coutts'
Centaurea macrocephala
Centaurea montana
Centaurea montana 'Alba'
Centaurea montana 'Gold Bullion'
Centaurea montana 'Purple Heart'
Centaurea nigra
Centaurea simplicicaulis
Centranthus ruber
Centranthus ruber 'Albus'
Centranthus ruber var. coccineus
Cephalaria gigantea
Cephalaria leucantha
Ceratostigma plumbaginoides AGM
Ceratostigma willmottianum AGM
Cerinthe major 'Purpurascens'
Cestrum parqui AGM
Chaenomeles speciosa
Chaenomeles speciosa 'Geisha Girl' (d) AGM
Chaerophyllum hirsutum 'Roseum'
Chamerion angustifolium 'Stahl Rose'
Chasmanthium latifolium
Chionochloa rubra
Chionodoxa forbesii
Chionodoxa luciliae 'Alba'
Chionodoxa 'Pink Giant'
Chrysanthemum 'Clara Curtis' (21d)
Cirsium rivulare 'Atropurpureum'
Cistus x purpureus AGM
Cistus x purpureus 'Alan Fradd'
Cistus x skanbergii AGM
Clematis integrifolia
Clematis 'Majojo' (Fo)
Clematis x cartmanii hort. 'Joe' (Fo/m)
Clerodendrum myricoides 'Ugandense' AGM
Clivia miniata AGM
Convolvulus althaeoides
Convolvulus cneorum AGM
Convolvulus sabatius dark-flowered
Coreopsis grandiflora 'Domino'
Coreopsis grandiflora 'Sunray'
Coreopsis 'Limerock Dream'
Coreopsis 'Limerock Ruby' (PBR)
Coreopsis 'Sterntaler'
Coreopsis verticillata CRÈME BRÛLÉE 'Crembru' (PBR)
(other names: Coreopsis verticillata 'Crembru' (PBR) (accepted))
Coreopsis verticillata 'Zagreb' AGM
Cornus canadensis AGM
Coronilla valentina subsp. glauca 'Variegata' (v)
Correa backhouseana AGM
Correa 'Dusky Bells' AGM
Corydalis cheilanthifolia
Corydalis flexuosa 'China Blue'
Corydalis flexuosa 'Purple Leaf'
Corydalis quantmeyeriana 'Chocolate Stars'
Corydalis solida
Corydalis solida subsp. solida 'George Baker' AGM
Cosmos atrosanguineus 'Chocamocha'
Crambe cordifolia AGM
Crocosmia 'John Boots'
Crocosmia 'Limpopo'
Crocosmia 'Lucifer' AGM
Crocosmia masoniorum 'Kiaora'
Crocosmia masoniorum 'Rowallane Yellow' AGM
Crocosmia 'Okavango' (PBR)
Crocosmia 'Orange Devil'
Crocosmia 'Orangeade'
Crocosmia pottsii 'Culzean Pink'
Crocosmia x crocosmiiflora 'Carmin Brillant' AGM
Crocosmia x crocosmiiflora 'Coleton Fishacre'
Crocosmia x crocosmiiflora 'Dusky Maiden'
Crocosmia x crocosmiiflora 'Eastern Promise'
Crocosmia x crocosmiiflora 'Emily McKenzie'
Crocosmia x crocosmiiflora 'Goldfinch'
Crocosmia x crocosmiiflora 'Honey Angels'
Crocosmia x crocosmiiflora 'Jessie'
Crocosmia x crocosmiiflora 'Lady Oxford'
Crocosmia x crocosmiiflora 'Mars'
Crocosmia x crocosmiiflora 'Norwich Canary'
Crocosmia x crocosmiiflora 'Saracen'
Crocosmia x crocosmiiflora 'Star of the East' AGM
Crocosmia x crocosmiiflora 'Vic's Yellow'
Crocosmia x crocosmiiflora 'Zeal Tan'
Crocosmia x crocosmioides 'Castle Ward Late'
Cyclamen coum AGM
Cyclamen coum subsp. coum f. pallidum 'Album'
Cyclamen hederifolium AGM
Cynara cardunculus (Scolymus Group) 'Purple Globe'
Cynara cardunculus (Scolymus Group) 'Vert Globe'
Cynara cardunculus AGM
Cynara cardunculus Scolymus Group
Cyrtanthus elatus AGM
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