| Cough | Relic Seeds | | 50/50 | View variety |
| Cough Bx1 | Relic Seeds | | 60/40 | View variety |
| Cough Drops | Crockett Family Farms | | 50/50 | View variety |
| CoughNRuntZ | Moab Genetix | | 50/50 | View variety |
| Countdown | Gage Green Genetics | | 60/40 | View variety |
| Countree Grammer | Skunk House Genetics | | 70/30 | View variety |
| Countrytime Kush | Thunderfudge | | 50/50 | View variety |
| Coup de Grace | Cult Classics Seeds | | 60/40 | View variety |
| Courage The Cowardly Dog | Oregon Microgrowers Guild | | 50/50 | View variety |
| Courtesy | Helvetic Seeds | | 40/60 | View variety |
| Courtesy x Dorothy | Helvetic Seeds | | 50/50 | View variety |
| Courvoisier | Red Bee Seeds | | 60/40 | View variety |
| Covelo Sour Diesel | MTG Seeds | | 60/40 | View variety |
| Cow Patty | The Bakery Genetics | | 60/40 | View variety |
| Cowboy Breath | Green Wolf Genetics | | 60/40 | View variety |
| Cowboy Cookies | Greenpoint Seeds | | 50/50 | View variety |
| Cowboy Kush | Greenpoint Seeds | | 60/40 | View variety |
| COxHSxCJxGG | Aficionado Seed Bank | | 70/30 | View variety |
| CPT OG | Night Owl Seeds | | 50/50 | View variety |
| CQ48 | Breeders Boutique | | 50/50 | View variety |