| 2006 | Callicarpa americana var. lactea |
| | Callicarpa bodinieri var. giraldii |
| 2004 | Callicarpa cathayana |
| 2004 | Callicarpa japonica |
| 2006 | Callicarpa yunnanensis |
| | Callistemon citrinus 'Splendens' |
| 2004 | Callistemon subulatus |
| 2009 | Callistemon viminalis 'Captain Cook' |
| | |
| 2004 | Calycanthus fertilis |
| 1992 | |
| | |
| 2010 2010 2010 2010 | Campsis x tagliabuana 'Huidam' Campsis 'Madame Galene' Campsis radicans 'Flava' Campsis radicans 'Flamenco' |
| 2004 | Campylotropis macrocarpa |
| 1992 | |
| 1995 | Caragana jubata |
| 2006 | |
| 1992 | Carpinus betulus 'Fastigiata' |
| 1995 | |
| 1994 | Carpinus betulus 'Purpurea' |
| 2004 | Carpinus japonica |
| 1999 | Carpinus monbeigiana |
| 2004 | Carpinus polyneura |
| 2009 | Carpinus shensiensis |
| 2006 | Carya fremontii |
| 2004 | Carya illinoinensis |
| 1991 | Carya laciniosa |
| 2004 | Caryopteris incana 'Autumn Pink' |
| 2004 | Caryopteris inoveris |
| 1999 | Castanea dentata |
| 1998 | Castanea mollissima |
| 1998 | Castanea sativa 'Albomarginata' |
| 1989 | Castanea sativa 'Asplenifolia' |
| 1992 | |
| 1989 | Castanea sativa 'Nouzillard' |
| 1998 | Castanea sativa 'Variegata' |
| 2006 | Castanopsis cuspidata |
| 1991 | |
| 1995 | |
| 1991 | |
| 1991 | Catalpa speciosa |
| 1991 | |
| 1991 | |
| 2008 | Cathaya argyro 'phylla' |
| 1999 | Ceanothus arboreus 'Blue Moon' (2) |
| 1994 | |
| 2009 | Ceanothus 'Diamond Heights' |
| 2002 | Ceanothus gloriosus 'Emily Brown' |
| 2000 | Ceanothus griseus var.horizontalis 'Yankee Point' |
| 1993 | Ceanothus prostratus 'Puget Blue' |
| | |
| 2003 | |
| 1993 | Celtis australis Celtis Biondii Celtis Jezoensis |
| 1998 | Celtis julianae |
| 1991 | Celtis occidentalis |
| 2006 | Celtis tournefortii |
| 2004 | Cephalanthus occidentalis |
| | |
| 2003 | Ceratostigma willmottianum |
| 1989 | Cercidiphyllum japonicum |
| 1999 | Cercidiphyllum japonicum 'Rotfuchs' |
| 1993 | Cercidiphyllum magnificum |
| 1999 | Cercis canadensis |
| 2001 | |
| 2006 | |
| 2006 | Cercis canadensis 'Melon Beauty' |
| 1998 | Cercis chinensis |
| 2004 | |
| 1999 | Cercis griffithii |
| 2004 | |
| 1991 | |
| 2005 | |
| | Chaenomeles japonica |
| 1990 | Chaenomeles sinensis |
| 1995 | Chaenomeles speciosa 'Umbilicata' |
| 2004 | |
| | |
| 2003 | Chimonanthus praecox |
| 2006 | Chimonanthus praecox 'Grandiflorus' |
| 1999 | |
| 1997 | |
| 1999 | Chitalpa x tashkensis |
| 1993 | Choisya 'Aztec Pearl' |
| 2003 | Choisya limo |
| 1993 | Choisya ternata |
| 1993 | Choisya ternata 'Sundance' |
| 2001 | Cinnamonum camphora |
| 2001 | Cistus laurifolius |
| 2004 | Cistus populifolius |
| 2006 | Cistus 'Wadim' |
| 2004 | Cistus x aguilarii 'Maculatus' |
| 2004 | |
| 2002 | Cistus x lenis florentinus 'Grayswood Pink' |
| 2004 | Citharexcylum spicatum |
| 2006 | Citrus fortunella 'Margarita' |
| 2006 | Citrus medica var. sarcodactylis |
| 1992 | |
| 2007 | Clematis armandii |
| 2007 | Clematis cirrhosa var. balearica |
| 2009 | Clematis 'Apple Blossom' |
| | |
| 2007 | Clematis urophylla 'Winter Beauty' |
| 2005 | Clerodendron trichotonum 'White Calyx' |
| 1997 | |
| 2004 | Clerodendrum bungei 'Pink diamond' |
| 1997 | |
| 1996 | |
| 2009 | Clethra acuminata |
| 1997 | Clethra alnifolia |
| 2003 | Clethra alnifolia 'Ruby Spice' |
| 2009 | Clethra arborea |
| 2008 | Clethra barbinervis |
| 2003 | Clethra delavay |
| 2009 | Clethra fargesii |
| 2009 | Clethra pinglei |
| 2009 | Clethra tomentosa |
| 1993 | |
| 2009 | Colocasia esculanta |
| 1992 | Colutea arborescens |
| 2001 | Colutea x media |
| 2001 | Coprosma x kirkii 'Variegata' |
| 2008 | Cordateria selloana 'Splendia Star' |
| 2004 | Cordyline australis 'Albertii' |
| 2004 | |
| 2004 | Coriaria myrtifolia |
| 2006 | Coriaria napalensis |
| | |
| 2009 | Correa backhouseana |
| 2001 | |
| 2004 | |
| | Corylus avellana |
| 2009 | Corylus avellana 'Anny's Red' |
| 1991 | Corylus avellana 'aurea' |
| 1993 | |
| 1989 | Corylus avellana 'Heterophylla' |
| 1994 | Corylus avellana 'Pendula' |
| 1992 2010 | Corylus colurna Corylus colurna 'Purpurea Fastigiata' |
| 2008 | Corylus colurna 'Te-Terra Red' |
| 1999 | Corylus mandshurica |
| 2006 | Corylus maxima 'Purpurea Contorta' |
| 2004 | Cotinus coggygria 'Flame' |
| 1994 | |
| 1993 | Cotinus coggygria 'Red Beauty' |
| 1991 | |
| 1994 | |
| 2001 | Cotoneastere cachmiriensis |
| 2001 | Cotoneastere horizontalis |
| 2007 | Cotoneastere horizontalis 'Variegatus' |
| 2008 | Crataegomespilus Grandiflora |
| 1995 | Crataegus azarolus |
| 2006 | Crataegus laevigata 'Crimson Cloud' |
| 1994 | Crataegus laevigata 'Paul's Scarlet' |
| 1990 | |
| 2006 | Crataegus laevigata 'Princesse Sturoza' |
| 2006 | |
| 2003 | Crataegus monogyna |
| 2009 | Crataegus x lavaleei |
| 1993 | |
| 2006 | |
| 2009 | Crinodendron Kookeriana 'reflexa' |
| 2000 | |
| | |
| | |
| | |
| | |
| 2010 | Cydonia oblonga Cyclobalanopsis angustinii |
| 1999 | Cynanchum acuminatifolium |
| 1989 | |
| 1998 | Cytisus battandieri |
| 2000 | Cytisus palette |
| 1992 | Cytisus scoparius |
| 2000 | Cytisus x beanii 'Burkwoodi'i |
| 2000 | Cytisus x kewensis 'Lena' |
| 1994 | Cytisus x praecox 'Allgold' |