California poppy
California poppy Eschscholzia californica
Canadian dwarf cornel
Canadian dwarf cornel Cornus canadensis
Canadian serviceberry
Canadian serviceberry Amelanchier canadensis
Canary marguerite
Canary marguerite Argyranthemum frutescens
Canterbury Bells
Canterbury Bells Campanula medium
Carnation
Carnation Dianthus caryophyllus
(1)
Castor oil plant
Castor oil plant Ricinus communis
Catnip
Catnip Nepeta cataria
Chamomile
Chamomile Matricaria recutita
Chard
Chard Beta vulgaris
Cheddar pink
Cheddar pink Dianthus gratianopolitanus
(2)
Cherry
Cherry Prunus cerasus
Cherry
Cherry Prunus avium
Cherry plum
Cherry plum Prunus cerasifera
Cherry-laurel
Cherry-laurel Prunus laurocerasus
(1)
Chicory
Chicory Cichorium intybus
China aster
China aster Callistephus chinensis
China fir
China fir Cunninghamia lanceolata
Chinese angelica tree
Chinese angelica tree Aralia chinensis
Chinese magnolia
Chinese magnolia Magnolia sieboldii
Chinese Peony
Chinese Peony Paeonia lactiflora
(25)
Chinese snowball
Chinese snowball Viburnum macrocephalum
Chinese wisteria
Chinese wisteria Wisteria sinensis
Chinese witch hazel
Chinese witch hazel Hamamelis mollis
Chives
Chives Allium schoenoprasum
(1)
Christmas rose
Christmas rose Helleborus niger
Chrysanthemum
Chrysanthemum Chrysanthemum
Cinnamon rose
Cinnamon rose Rosa majalis
Clammy Locust
Clammy Locust Robinia viscosa
Clematis
Clematis Clematis
(3)
Climbing hydrangea
Climbing hydrangea Hydrangea petiolaris
(3)
Clusius gentian
Clusius gentian Gentiana clusii
Coleus
Coleus Plectranthus scutellarioides
Columbine
Columbine Aquilegia
Common barberry
Common barberry Berberis vulgaris
Common Blue Violet
Common Blue Violet Viola sororia
Common box
Common box Buxus sempervirens
(5)
Common Broom
Common Broom Chamaecytisus
Common Cotoneaster
Common Cotoneaster Cotoneaster integerrimus
Common cowslip
Common cowslip Primula veris
Common elder
Common elder Sambucus nigra
Common heather
Common heather Calluna vulgaris
(263)
Common hop
Common hop Humulus lupulus
Common Juniper
Common Juniper Juniperus communis
(1)
Common laburnum
Common laburnum Laburnum anagyroides
Common lilac
Common lilac Syringa vulgaris
(77)
Common Peony
Common Peony Paeonia officinalis
Common sage
Common sage Salvia officinalis
(1)
Common snowberry
Common snowberry Symphoricarpos
Common snowdrop
Common snowdrop Galanthus nivalis
Common walnut
Common walnut Juglans regia
Common yarrow
Common yarrow Achillea millefolium
(5)
Coneflower
Coneflower Rudbeckia
Coral flower
Coral flower Heuchera
(190)
Coriander
Coriander Coriandrum
Corkscrew willow
Corkscrew willow Salix babylonica
Corn poppy
Corn poppy Papaver rhoeas
Cornelian cherry
Cornelian cherry Cornus mas
Cosmos
Cosmos Cosmos bipinnatus
Coville's phlox
Coville's phlox Phlox covillei
Cowberry
Cowberry Vaccinium vitis-idaea
Cranberry
Cranberry Vaccinium macrocarpon
Creeping Bellflower
Creeping Bellflower Campanula rapunculoides
Creeping jenny
Creeping jenny Lysimachia nummularia
(1)
Creeping juniper
Creeping juniper Juniperus horizontalis
(1)
Creeping Myrtle
Creeping Myrtle Vinca
Creeping Phlox
Creeping Phlox Phlox subulata
(3)
Creeping zinnia
Creeping zinnia Sanvitalia procumbens
Crimson Bottlebrush
Crimson Bottlebrush Callistemon citrinus
Crown Imperials
Crown Imperials Fritillaria imperialis
Cup and saucer vine
Cup and saucer vine Cobaea scandens
Curly-leafed Cabbage
Curly-leafed Cabbage Brassica oleracea
Cushion spurge
Cushion spurge Euphorbia epithymoides
Cypress Spurge
Cypress Spurge Euphorbia cyparissias