| Callistemon citrinus |
| Callistemon rigidus |
| Calycanthus floridus |
| Camellia japonica 'Adolphe Audusson' (AGM) |
| Camellia japonica 'Anemoniflora' |
| Camellia japonica 'Blood of China' |
| Camellia japonica 'Elizabeth Hawkins' |
| Camellia japonica 'Fred Sander' |
| Camellia japonica 'Guilio Nuccio' (AGM) |
| Camellia japonica 'Jupiter' (AGM) |
| Camellia japonica 'Lady Vansittart' |
| Camellia japonica 'Moshe Dayan' |
| Camellia japonica 'Optima Rosea' |
| Camellia japonica 'Saturnia' |
| Camellia japonica 'Tomorrow' |
| Camellia 'Leonard Messel' (AGM) |
| Camellia sasanqua 'Narumigata' (AGM) |
| Camellia x williamsii 'Anticipation' (AGM) |
| Camellia x williamsii 'Debbie' (AGM) |
| Camellia x williamsii 'Donation' (AGM) |
| Camellia x williamsii 'J.C.Williams' (AGM) |
| Caryopteris x clandonensis |
| Caryopteris x clandonensis 'Arthur Simmonds' (AGM) |
| Caryopteris x clandonensis 'Ferndown' |
| Caryopteris x clandonensis 'Heavenly Blue' (AGM) |
| Caryopteris x clandonensis 'Kew Blue' |
| Caryopteris x clandonensis 'Worcester Gold' |
| Caryopteris incana |
| Ceanothus 'Blue Cushion' |
| Ceanothus 'Blue Jeans' |
| Ceanothus 'Blue Mound' |
| Ceanothus cuneatus rigidus |
| Ceanothus cuneatus rigidus 'Snowball' |
| Ceanothus gloriosus 'Emily Brown' |
| Ceanothus griseus horizontalis 'Yankee Point' |
| Ceanothus x pallidus 'Marie Simon' |
| Ceanothus 'Pincushion' |
| Ceanothus thyrsiflorus repens |
| Ceanothus 'Pershore Zanzibar' |
| Ceratostigma abyssinicum |
| Ceratostigma griffithii |
| Ceratostigma plumbaginoides (AGM) |
| Ceratostigma willmottianum (AGM) |
| Ceratostigma wilmottianum 'Forest Blue' |
| Cercis canadensis 'Forest Pansy' (AGM) |
| Cercis chinensis 'Avondale' |
| Cercis siliquastrum (AGM) |
| Chaenomeles speciosa 'Geisha Girl' |
| Chaenomeles speciosa 'Moerloosei' (AGM) |
| Chaenomeles speciosa 'Nivalis' |
| Chaenomeles speciosa 'Simonii' |
| Chaenomeles x superba 'Crimson & Gold' (AGM) |
| Chaenomeles x superba 'Fire Dance' |
| Chaenomeles x superba 'Jet Trail' |
| Chaenomeles x superba 'Knap Hill Scarlet' (AGM) |
| Chaenomeles x superba 'Lemon & Lime' |
| Chaenomeles x superba 'Nicoline' (AGM) |
| Chaenomeles x superba 'Pink Lady' (AGM) |
| Chaenomeles x superba 'Red Trail' |
| Chaenomeles x superba 'Rowallane' (AGM) |
| Chamaecytisus purpureus |
| Chiliotrichum diffusum 'Siska' |
| Chimonanthus praecox |
| Choisya 'Aztec Pearl' (AGM) |
| Choisya ternata (AGM) |
| Choisya ternata 'Sundance' (AGM) |
| Cistus x aguilari |
| Cistus x aguilarii 'Maculatus' (AGM) |
| Cistus 'Chelsea Bonnet' |
| Cistus creticus creticus |
| Cistus x cyprius (syn.ladanifer) (AGM) |
| Cistus x dansereaui 'Decumbens' (AGM) |
| Cistus x florentinus (syn monspeliensis) |
| Cistus 'Golden Treasure' |
| Cistus 'Grayswood Pink' |
| Cistus x hybridus (syn. corbariensis) (AGM) |
| Cistus x laxus 'Snow White' |
| Cistus laurifolius (AGM) |
| Cistus x nigricans (syn. obtusifolius) |
| Cistus 'Peggy Sammons' (AGM) |
| Cistus x pulverulentus (syn. crispus) (AGM) |
| Cistus x pulverulentus 'Sunset' |
| Cistus x purpureus (AGM) |
| Cistus 'Silver Pink' |
| Cistus x skanbergii (AGM) |
| Clerodendrum bungei |
| Clerodendrum trichotomum |
| Clethra alnifolia 'Pink Spire' |
| Colquhounia coccinea vestita |
| Colutea arborescens |
| Convolvulus cneorum (AGM) |
| Coprosma 'Beatson's Gold' |
| Coprosma x kirkii 'Kirkii Variegata' |
| Cordyline australis (AGM) |
| Cordyline australis 'Coffee Cream' |
| Cordyline australis purpurea |
| Cordyline australis 'Purple Tower' |
| Cordyline australis 'Red Star' |
| Cordyline australis 'Sundance' |
| Cordyline australis 'Torbay Dazzler' |
| Cordyline australis 'Torbay Red ' |
| Cornus alternifolia 'Argentea' |
| Cornus alba 'Aurea' |
| Cornus alba 'Elegantissima' (AGM) |
| Cornus alba 'Gouchaultii' |
| Cornus alba 'Ivory Halo' |
| Cornus alba 'Kesselringii' |
| Cornus alba 'Sibirica' ('Westonbirt') |
| Cornus alba 'Sibirica Variegata' |
| Cornus alba 'Spaethii' (AGM) |
| Cornus canadensis (AGM) |
| Cornus kousa chinensis (AGM) |
| Cornus mas (AGM) |
| Cornus mas 'Variegata' (AGM) |
| Cornus sanguinea 'Midwinter Fire' |
| Cornus stolonifera 'Flaviramea' (AGM) |
| Cornus stolonifera 'Kelseyi' |
| Corokia x virgata |
| Corokia x virgata 'Red Wonder' |
| Corokia x virgata 'Yellow Wonder' |
| Correa 'Mannii' (AGM) |
| Corylopsis pauciflora (AGM) |
| Corylus avellana |
| Corylus avellana 'Contorta' (AGM) |
| Corylus maxima 'Purpurea' |
| Cotinus coggygria |
| Cotinus coggygria 'Notcutt's Variety' |
| Cotinus coggygria 'Royal Purple' (AGM) |
| Cotinus coggygria 'Rubrifolius' |
| Cotinus 'Flame' |
| Cotinus 'Grace' (AGM) |
| Cotoneaster atropurpureus 'Variegatus' (AGM) |
| Cotoneaster cochleatus (AGM) |
| Cotoneaster conspicuus 'Decorus' (AGM) |
| Cotoneaster dammeri (AGM) |
| Cotoneaster franchetii |
| Cotoneaster frigidus 'Cornubia' (AGM) |
| Cotoneaster 'Herbstfeuer' ('Autumn Fire') |
| Cotoneaster horizontalis (AGM) |
| Cotoneaster lacteus (AGM) |
| Cotoneaster microphyllus (AGM) |
| Cotoneaster moupinensis |
| Cotoneaster nanshan |
| Cotoneaster procumbens 'Queen of Carpets' |
| Cotoneaster radicans 'Eichholz' |
| Cotoneaster salicifolius 'Rothschildianus' (AGM) |
| Cotoneaster simonsii (AGM) |
| Cotoneaster x suecicus 'Coral Beauty' |
| Cotoneaster x watereri |
| Crinodendron hookerianum (AGM) |
| Cytisus battandieri (AGM) |
| Cytisus x beanii (AGM) |
| Cytisus 'Boskoop Ruby' (AGM) |
| Cytisus 'Burkwoodii' (AGM) |
| Cytisus 'Dukaat' |
| Cytisus 'Goldfinch' |
| Cytisus 'Golden Sunlight' |
| Cytisus 'Hollandia' (AGM) |
| Cytisus x kewensis (AGM) |
| Cytisus 'Killiney Salmon' |
| Cytisus 'La Coquette' |
| Cytisus 'Lena' (AGM) |
| Cytisus 'Luna' (AGM) |
| Cytisus 'Minstead' |
| Cytisus x praecox 'Albus' |
| Cytisus x praecox 'Allgold' (AGM) |
| Cytisus x praecox 'Goldspeer' |
| Cytisus x praecox 'Warminster' (AGM) |
| Cytisus scoparius andreanus (AGM) |
| Cytisus 'Windlesham Ruby' |
| Cytisus 'Zeelandia' (AGM) |