| Core Damage | Anesia Seeds | | 60/40 | View variety |
| Corked | Wizard Trees | | 60/40 | View variety |
| Corleone Kush | The Cali Connection | | 90/10 | View variety |
| Corleone Kush F1 | Rarebreed Genetics | | 60/40 | View variety |
| Corleone Kush x Do-Si-Dos | Philosopher Seeds | | 70/30 | View variety |
| Corn Cob | Archive Seed Bank | | 60/40 | View variety |
| Corn Syrup | Cookie Fam Genetics | | 60/40 | View variety |
| Cornbread | Rare Dankness Seeds | | 70/30 | View variety |
| Cornbread Candy | 2 Guns and a Guy Seed Company | | 70/30 | View variety |
| Cornerstone | Gage Green Genetics | | 60/40 | View variety |
| Cornetto | Cannabella Genetics | | 40/60 | View variety |
| Cornucopia Utopia | The Bakery Genetics | | 50/50 | View variety |
| Corpse Paint | Wyeast Farms | | 60/40 | View variety |
| Cortez The Killer | Swamp Boys Seeds | | 70/30 | View variety |
| Cosa Nostra | Brujo Seeds | | 50/50 | View variety |
| Cosmic 22 | Exotic Genetix | | 60/40 | View variety |
| Cosmic Adventure | Unknown | | 70/30 | View variety |
| Cosmic Apprentice | Night Owl Seeds | | 60/40 | View variety |
| Cosmic Berry | Natural Genetics Seeds | | 60/40 | View variety |
| Cosmic Bomb Auto | Bomb Seeds | | 50/50 | View variety |