| Kromed Lemons | Thunderfudge | | 50/50 | View variety |
| Kronocaine | Breeders Choice | | 50/50 | View variety |
| Krop Killer | SnowHigh Seeds | | 60/40 | View variety |
| Krowberry | Unknown | | 60/40 | View variety |
| Kruntz | Bask Triangle Farms | | 60/40 | View variety |
| Krylon | ThugPug Genetics | | 50/50 | View variety |
| Krypto | Secret Society Seed Co | | 70/30 | View variety |
| Krypto Cookies | Moxie 710 | | 50/50 | View variety |
| Kryptochronic | Unknown | | 70/30 | View variety |
| Krypton OG | Lupos CannaSeed | | 70/30 | View variety |
| Kryptonite | Pyramid Seeds | | 60/40 | View variety |
| Kryptonite OG | Karma Genetics | | 60/40 | View variety |
| Krystalica | Mandala Seeds | | 20/80 | View variety |
| Ksmorz | Prolific Coast Seeds | | 60/40 | View variety |
| Kublai | Slanted Farms Seed Company | | 70/30 | View variety |
| Kuchi | The Devil's Harvest Seed Company | | 60/40 | View variety |
| Kudaffie | Red Scare Seed Company | | 60/40 | View variety |
| Kudra (Kudaffie lineage, Red Scare Seed Company) | Unknown | | Unavailable | View variety |
| Kudra (Silk Route lineage, Red Scare Seed Company) | Unknown | | Unavailable | View variety |
| Kukulkan | Pyramid Seeds | | 80/20 | View variety |