'Colchester' Japanese Water Iris 'Colchester White' Bachelors' Button
'Colchester White' Dusty Miller Colchicum, Showy (spp.)
Colchicum, Showy 'The Giant' Coleus (spp.)
Coleus 'ColorBlaze® Dipt in Wine' Coleus 'Gay's Delight'
Coleus 'India Frills' Coleus 'Kong Rose'
Coleus 'Mars' Coleus 'Micawpy'
Coleus 'Victoria Ruffles' Coleus 'Wizard™ Golden'
Coleus 'Wizard™ Jade' Coleus 'Wizard™ Mix'
Coleus, Flowering Bush Coleus: hybrid 'Pineapple Queen'
Colewort (spp.) Colewort 'Nagoya Purple'
Colewort 'Nagoya Red' Colewort 'Nagoya White'
Colewort 'Red Peacock' Colewort 'Redbor'
Colewort 'White Peacock' Colewort: cordifolia
Collard (spp.) Collard 'Nagoya Purple'
Collard 'Nagoya Red' Collard 'Nagoya White'
Collard 'Red Peacock' Collard 'Redbor'
Collard 'White Peacock' 'Color Fashion' Common Sunflower
'Color Glory' Hosta 'Color Guard' Adam's Needle Yucca
'Color Splash' Garden Petunia 'Colorado Gold' Gazania
'ColorBlaze® Dipt in Wine' Coleus 'Colorcade Lavender' Ivy Geranium
'Colorful Expressions™ Cherry Rose' Trailing Petunia 'Colorful Expressions™ Cranberry' Trailing Petunia
'Colorful Expressions™ Rose' Trailing Petunia 'Colorful Expressions™ Scarlet Red' Trailing Petunia
'Colorpower Purple Flame' New Guinea Impatiens 'Colrain Red' Bee Balm: Monarda
Coltsfoot Columbia Lily
Columbine Meadow Rue (spp.) Columbine (spp.)
Columbine 'Blue Shades' Columbine 'Crimson Star'
Columbine 'Dorothy Rose' Columbine 'Dragon Fly Mix'
Columbine 'Heidi' Columbine 'McKana's Giant'
Columbine 'Ministar' Columbine 'Musfe'
Columbine 'Origami Blue and White' Columbine 'Robin (Songbird Series)(n)'
Columbine, Alpine Columbine, Barrel
Columbine, Chiricahua Mountain Columbine, Common (spp.)
Columbine, Common 'Corbett' Columbine, Crimson
Columbine, Dwarf (spp.) Columbine, Dwarf 'Cameo Mix'
Columbine, Dwarf 'Cameo Pink-White' Columbine, Dwarf Dwarf
Columbine, Dwarf White Columbine, European (spp.)
Columbine, European 'Black Barlow' Columbine, European 'Grandmother's Garden'
Columbine, European 'Tower Light Pink' Columbine, European 'Winky Blue-White'
Columbine, European 'Winky Purple-White' Columbine, European 'Winky Red-White'
Columbine, European 'Winky Rose-Rose' Columbine, Fan (spp.)
Columbine, Fan 'Cameo Mix' Columbine, Fan 'Cameo Pink-White'
Columbine, Fan Dwarf Columbine, Fan White
Columbine, Golden Columbine, Hinkley's Yellow
Columbine, Rocky Mountain (spp.) Columbine, Rocky Mountain 'Red Hobbit'
Columbine, Texas Gold Columbine, Western
Columbine, Wild Red (spp.) Columbine, Wild Red 'Corbett'
Columbine, Wild (spp.) Columbine, Wild 'Corbett'
Columbine: formosa, Wild Red Column Cactus (spp.)
Column Cactus 'Monstrosus' Columnea
'Comanche' Waterlily Comfrey (spp.)
Comfrey, Caucasian Comfrey, Ground Cover (spp.)
Comfrey, Russian 'Axminster Gold' Comfrey, Russian Variegated
Comfrey: officinale