| High Voltage | SnowHigh Seeds | | 50/50 | View variety |
| High Voltage | Poppa Pain Strains | | 30/70 | View variety |
| High Wired | Elev8 Seeds | | 60/40 | View variety |
| Highbiscus Thai | Coastal Seed Co | | 20/80 | View variety |
| Highbro Cookies | Exclusive Seeds | | 70/30 | View variety |
| HighCloudz Auto | Green House Seeds | | 50/50 | View variety |
| Higher Primate | Bodhi Seeds | | 60/40 | View variety |
| Higher Vibe | Gage Green Genetics | | 60/40 | View variety |
| Highland Oaxacan Gold | Green Mountain Seeds | | 0/100 | View variety |
| Highland Oxacan Gold | Unknown | | 0/100 | View variety |
| Highland Queen | Goat and Monkey Seeds | | 70/30 | View variety |
| Highland Thai | The Real Seed Company | | 0/100 | View variety |
| Highlander | Ocean Grown Seeds | | 60/40 | View variety |
| HighLife | Oregon Green Seed | | 50/50 | View variety |
| Highlighter | Lit Farms | | 60/40 | View variety |
| Highlo | House Of The Great Gardener | | 40/60 | View variety |
| Highlux | Night Owl Seeds | | 60/40 | View variety |
| Highmac F2 | Sunken Treasure Seeds | | 50/50 | View variety |
| HighQ | Envy Genetics | | 70/30 | View variety |
| Hightech (Hectane lineage, Grandiflora Genetics) | Unknown | | Unavailable | View variety |