| Koffee Cake | Pacific NW Roots | | 90/10 | View variety |
| Koffee Cake IX | Pacific NW Roots | | 90/10 | View variety |
| Koffee F2 | Pacific NW Roots | | 90/10 | View variety |
| Koffee F3 | Pacific NW Roots | | 90/10 | View variety |
| Koffee Face | Pacific NW Roots | | 80/20 | View variety |
| Koffee IX | Pacific NW Roots | | 100/0 | View variety |
| Koffee Kubed | Pacific NW Roots | | 90/10 | View variety |
| Koffee Limedog | Pacific NW Roots | | 80/20 | View variety |
| Kogi | NorStar Genetics | | 50/50 | View variety |
| Koh-I-Nor | No Mercy Supply | | 50/50 | View variety |
| KoKo | Pacific NW Roots | | 70/30 | View variety |
| Koko Puffs | Exotic Genetix | | 60/40 | View variety |
| Kolossus | Sannie's Seeds | | 50/50 | View variety |
| Kombucha Cream | Atlas Seed | | 70/30 | View variety |
| Kompolti | Unknown | | 20/80 | View variety |
| Kona Gold | Pua Mana Pakalolo | Selected from: The Blood · Hawaiian Bloodline | 0/100 | View variety |
| Kona Sunset | Gooey Breeder Seeds | | 20/80 | View variety |
| Kona Thai [1970] (Tropsanto Kona lineage, Equilibrium Genetics) | Unknown | | Unavailable | View variety |
| Kong | Unknown | | 80/20 | View variety |
| Kong | Holy Smoke Seeds | | 50/50 | View variety |