| Madhatter | Alphakronik Genes | | 70/30 | View variety |
| Madi Gras Marmalade | The Bakery Genetics | | 70/30 | View variety |
| Madi Largo | Greenpoint Seeds | | 60/40 | View variety |
| Madness | Hazeman Seeds | | 80/20 | View variety |
| Madness | World of Seeds Bank | | 60/40 | View variety |
| Madonna | Sannie's Seeds | | 50/50 | View variety |
| MAF | Growers Choice | | 80/20 | View variety |
| MAF 2.0 | Growers Choice | | 50/50 | View variety |
| Mafia Funeral | Compound Genetics | | 60/40 | View variety |
| Magenta99 | Dutchgrown Seeds | | 60/40 | View variety |
| Magic Bluegrass (Blue Dragongrass lineage, Magic Spirit Seed Co.) | Unknown | | Unavailable | View variety |
| Magic Bud | Paradise Seeds | | 40/60 | View variety |
| Magic Bullet | Unknown | | 40/60 | View variety |
| Magic Carrot | ACE Seeds | | 40/60 | View variety |
| Magic Castle | Night Owl Seeds | | 60/40 | View variety |
| Magic Cookies Auto V1.2 | RocBudInc | | 60/40 | View variety |
| Magic Crystal | De Sjamaan | | 50/50 | View variety |
| Magic Dragon | Smoke A Lot Seeds | | 60/40 | View variety |
| Magic Eraser | Tiger Trees | | 40/60 | View variety |
| Magic Fire | THC Development Seed Company | | 70/30 | View variety |