Coneflower, Clasping Cool-tankard
Copperleaf: Alternanthera 'Red Threads' 'Coppertone (Red Shield)' Red Leaf Hibiscus
'Cordoba' Black-eyed Susan Coreopsis, Annual (spp.)
Coreopsis, Annual 'Mahogany Midget' Coreopsis, Annual 'Mardi Gras'
Coreopsis, Dyer's (spp.) Coreopsis, Dyer's 'Mahogany Midget'
Coreopsis, Dyer's 'Mardi Gras' Coreopsis, Plains (spp.)
Coreopsis, Plains 'Mahogany Midget' Coreopsis, Plains 'Mardi Gras'
Corn Cockle Corn Poppy
Corn (spp.) Corn 'Bars & Stripes'
Corn 'Indian Summer' Corn 'King Arthur'
Corn 'Tiger Cub' Corn Variegated
Corn, Sweet (spp.) Corn, Sweet 'Bars & Stripes'
Corn, Sweet 'Indian Summer' Corn, Sweet 'King Arthur'
Corn, Sweet 'Tiger Cub' Corn, Sweet Variegated
Cornflower (spp.) Cornflower 'Florence White'
'Corona Cherry Magic' Carnation: Dianthus 'Cortee Yellow' American Marigold
'Cosmic Orange' Sulphur Cosmos 'Cosmic Yellow' Sulphur Cosmos
Cosmos, Common (spp.) Cosmos, Common 'Early Wonder'
Cosmos, Common 'Sonata White' Cosmos, Garden (spp.)
Cosmos, Garden 'Early Wonder' Cosmos, Garden 'Sonata White'
Cosmos, Southwestern (spp.) Cosmos, Southwestern 'Early Wonder'
Cosmos, Southwestern 'Sonata White' Cosmos, Sulphur (spp.)
Cosmos, Sulphur 'Cosmic Orange' Cosmos, Sulphur 'Cosmic Yellow'
Cosmos, Sulphur 'Ladybird Scarlet' Cosmos, Sulphur 'Lemon Twist'
Cosmos, Sulphur 'Sunny Red' Cosmos, Yellow (spp.)
Cosmos, Yellow 'Cosmic Orange' Cosmos, Yellow 'Cosmic Yellow'
Cosmos, Yellow 'Ladybird Scarlet' Cosmos, Yellow 'Lemon Twist'
Cosmos, Yellow 'Sunny Red' Cottage Pink (spp.)
Cottage Pink 'Vanilla' Cotton
Cotton, Arabian 'Nigra' Cotton, Levant 'Nigra'
Cotton, Wild (spp.) Cotton, Wild 'Luna Red'
Crabgrass Crane Flower
Creeping Scaevola (spp.) Creeping Snapdragon (spp.)
Creeping Zinnia (spp.) Creeping Zinnia 'Gold Braid'
Creeping Zinnia 'Irish Eyes' Creeping Zinnia 'Mandarin Orange'
Creeping Zinnia: angustifolia (spp.) Creeping Zinnia: angustifolia 'Classic Golden Orange'
Creeping Zinnia: angustifolia 'Crystal Orange' Creeping Zinnia: angustifolia 'Crystal White'
Creeping Zinnia: angustifolia 'Crystal Yellow' Creeping Zinnia: angustifolia 'Star White'
Creeping Zinnia: angustifolia 'Starbright Mix' 'Creme de Cassis' Hollyhock
Crested Celosia (spp.) Crested Celosia 'Bombay Purple'
Crested Celosia 'Bombay Yellow Gold' Crested Celosia 'Jewel Box Golden Yellow'
Crested Celosia 'Jewel Box Salmon' Crested Celosia 'Kardinal Improved'
Crested Celosia 'Karume' Crested Celosia 'Prestige Scarlet'
Crested Celosia 'Purple with purple leaves' Crested Celosia 'Red Velvet'
Crested Celosia 'Startrek Rose Pink' 'Crimson Ultra Star' Garden Petunia
'Crispum' Sweet Basil Crowfoot, Water
'Crown Jewels' Purple Net Toadflax 'Crown Light Mauve' Snapdragon
'Crystal Orange' Creeping Zinnia: angustifolia 'Crystal White' Creeping Zinnia: angustifolia
'Crystal Yellow' Creeping Zinnia: angustifolia Cucumber, Bitter 'Spindle'
Cup Flower, White Cupflower 'Mont Blanc'