| Coconut Cream | Perfect Tree | | 60/40 | View variety |
| Cocoon | Bodhi Seeds | | 50/50 | View variety |
| Cocopopo | Bulk Seed Bank | | 20/80 | View variety |
| Code Blue | Archive Seed Bank | | 50/50 | View variety |
| Code Red | Exotic Genetix | | 50/50 | View variety |
| Coffe Rocket | Bulk Seed Bank | | 70/30 | View variety |
| Coffee Breath | The Bakery Genetics | | 60/40 | View variety |
| Coffee Cake | Alphakronik Genes | | 70/30 | View variety |
| Coffee Creamer | Seed Junky Genetics | | 60/40 | View variety |
| Coffee Crisps | Greenpoint Seeds | | 80/20 | View variety |
| Cognac Black | Bloom Seed Co | | 60/40 | View variety |
| Cognition | Tropical Seeds Company | | 0/100 | View variety |
| Cognition Amplifier | Ronin Garden | | 40/60 | View variety |
| Cognitive Liberty | Nerds Genetics | | 70/30 | View variety |
| COHP17 | Cultivated Choice Genetics | | 50/50 | View variety |
| Coked Out Girl Scout | CSI Humboldt | | 60/40 | View variety |
| Cokehead Slut | Riot Seeds | | 60/40 | View variety |
| Cold Cookies | Prolific Coast Seeds | | 70/30 | View variety |
| Cold Creek Kush | TH Seeds | | 70/30 | View variety |
| Cold Fusion | Wyeast Farms | | 40/60 | View variety |