| Kullu Valley | Khalifa Genetics | | 0/100 | View variety |
| Kumamotoz | Compound Genetics | | 50/50 | View variety |
| Kumaoni | The Real Seed Company | | 0/100 | View variety |
| Kumari (Kumari x Kandahar F2 lineage, Red Scare Seed Company) | Unknown | | Unavailable | View variety |
| Kumari (Nepalese Kandywine lineage, Red Scare Seed Company) | Unknown | | Unavailable | View variety |
| Kumari x Kandahar F2 | Red Scare Seed Company | | 80/20 | View variety |
| Kumbawa | Perfect Tree | | 60/40 | View variety |
| Kumquat | Kre8 Genetics | | 60/40 | View variety |
| Kundalini | Magic Strains | | 50/50 | View variety |
| Kundoz | Afghan Selection | | 80/20 | View variety |
| Kundoz Village x Mazar I Sharif | Red Scare Seed Company | | 100/0 | View variety |
| Kuntz | Pheno Finder Seeds | | 70/30 | View variety |
| Kuntz N Cream | Pheno Finder Seeds | | 70/30 | View variety |
| Kurious Orange | Bio Vortex | | 60/40 | View variety |
| Kurple Fantasy | Unknown | | 60/40 | View variety |
| Kurple Fantasy | Cult Classics Seeds | | 60/40 | View variety |
| Kurple Fantasy x Rainbow Crushers | Cannarado Genetics | | 80/20 | View variety |
| Kuru Kashi | James Loud Genetics | | 60/40 | View variety |
| Kusai | Swamp Boys Seeds | | 50/50 | View variety |
| Kush | Unknown | | 100/0 | View variety |