| Cosmopolis | Exotic Genetix | | 60/40 | View variety |
| Cosmopolitan | Envy Genetics | | 70/30 | View variety |
| Cost Nostra | Slanted Farms Seed Company | | 50/50 | View variety |
| Cotton Bud Automatic | Zamnesia | | 100/0 | View variety |
| Cotton Candy | Federation Seed Company | | 80/20 | View variety |
| Cotton Candy | Delicious Seeds | | 50/50 | View variety |
| Cotton Candy Auto | Atlas Seed | | 50/50 | View variety |
| Cotton Candy Cane | Emerald Triangle | | 60/40 | View variety |
| Cotton Candy Crunch | Copycat Genetix | | 70/30 | View variety |
| Cotton Candy Grapes | Envy Genetics | | 60/40 | View variety |
| Cotton Candy Grapes | Diamond Rock Genetics | | 50/50 | View variety |
| Cotton Candy Kush Early Version | Delicious Seeds | | 50/50 | View variety |
| Cotton Candy Lobster | Cipher Genetics | | 60/40 | View variety |
| Cotton Candy Runtz | Copycat Genetix | | 60/40 | View variety |
| Couch Party | Skunktek | | 60/40 | View variety |
| Couch Project | Bald man Lala Seeds | | 90/10 | View variety |
| Couch Slouch | Thunderfudge | | 50/50 | View variety |
| Couchlock | British Columbia Seed Company | | 50/50 | View variety |
| Cougar Milk | Bodhi Seeds | | 70/30 | View variety |
| Cougar Piss | Rare Dankness Seeds | | 60/40 | View variety |