| Jammy | Irie Genetics | | 40/60 | View variety |
| Jammy Dodgers | Mephisto Genetics | | 60/40 | View variety |
| Jamon & Melon | The Grateful Seeds | | 50/50 | View variety |
| Jamz | In House Genetics | | 60/40 | View variety |
| Jane Doe Kush (HP 21 lineage, Top Dawg Seeds) | Unknown | | Unavailable | View variety |
| Jane Doe Kush (Sour P 21 lineage, Top Dawg Seeds) | Unknown | | Unavailable | View variety |
| Jane Doe Skunk | Top Dawg Seeds | | 60/40 | View variety |
| Japanese Kaiju (Ikigai lineage, The Bakery Genetics) | Unknown | | Unavailable | View variety |
| Jarilla Sinaloa | Cannabiogen | | 0/100 | View variety |
| Jauja | Delicatessen | Congo · [#1] × Congo · [#2] | 60/40 | View variety |
| Jaw Dropper | Terp Fi3nd | | 60/40 | View variety |
| Jawa | Rare Dankness Seeds | | 90/10 | View variety |
| Jawa Kush | Ocean Grown Seeds | | 70/30 | View variety |
| Jawa Pie | Ocean Grown Seeds | | 70/30 | View variety |
| Jawbreaker OG | Enlightened Genetics | | 60/40 | View variety |
| Jazz | Dr. Greenthumb | | 20/80 | View variety |
| Jazz Berry Jam | CannaVenture Seeds | | 50/50 | View variety |
| Jazz Queen | Heroes of the Farm | | 40/60 | View variety |
| Jazz The Glass | Best Coast Genetics | | 50/50 | View variety |
| JBad 3way | Red Scare Seed Company | | 90/10 | View variety |