| Magpie | Best Coast Genetics | | 50/50 | View variety |
| Maharaja Haze | Khalifa Genetics | | 10/90 | View variety |
| Mahayana | Karma Genetics | | 70/30 | View variety |
| Mahi-Mahi Burger | Pua Mana Pakalolo | | 30/70 | View variety |
| Mai Tai | Clearwater Genetics | | 50/50 | View variety |
| Mai Tai | Philosopher Seeds | | 60/40 | View variety |
| Maid of Honor | Secret Society Seed Co | | 70/30 | View variety |
| Maiden Voyage | Keys to the Kingdom | | 60/40 | View variety |
| Mailbox Money | Compound Genetics | | 60/40 | View variety |
| Main Event | Jinxproof Genetics | | 50/50 | View variety |
| Main Squeeze | Jinxproof Genetics | | 50/50 | View variety |
| Majestic 13 | Lucky 13 Seed Company | | 50/50 | View variety |
| Majin Buu | Unknown | | 60/40 | View variety |
| Major Flavorz | Scapegoat Genetics | | 50/50 | View variety |
| Major Toke | Mephisto Genetics | | 50/50 | View variety |
| Major White | Elev8 Seeds | | 60/40 | View variety |
| MAK 10 | Ultra Genetics | | 40/60 | View variety |
| Make America Grape Again | The Bakery Genetics | | 60/40 | View variety |
| Makeda | Night Owl Seeds | | 60/40 | View variety |
| Mako Haze | Kiwiseeds | | 50/50 | View variety |