| Strain name | Breeder | Flowering time | Strain heritage | Feminized |
|---|---|---|---|---|
| Auto Yeti | Short Stuff Seedbank | 60 | ruderalis / indica / sativa | feminized |
| Auto Yuhbary | Anesia Seeds | 74 | ruderalis / sativa | feminized |
| Auto Yumbolt | CBD Seeds | 67 | ruderalis / indica | feminized |
| Y Griega | Medical Seeds Co. | 85 | mostly sativa | feminized |
| Y Griega CBD | Medical Seeds Co. | 68 | mostly sativa | feminized |
| Y Griega CBD 2.0 | Medical Seeds Co. | 70 | indica / sativa | feminized |
| Y2K | Vancouver Island Seed Company | 49 | indica | regular |
| Y2K Purps | Dirt Farmer Genetics | 60 | mostly indica | regular |
| Ya Hemi | Grandiflora Genetics | 63 | mostly sativa | regular |
| Ya Mar | The Bank Genetics | 63 | mostly sativa | feminized |
| Ya Sisters Cream Pie | Holy Perogy | 60 | indica / sativa | regular |
| Yabba Dabba Diesel | Sub Rosa Gardens | - | mostly indica | regular |
| Yacht Poison | Patchwerk Genetics | 70 | mostly indica | regular |
| Yakuza | Motherland Genetics | 55 | indica / sativa | feminized |
| Yakuza Kush | The Bakery Genetics | 63 | indica / sativa | regular |
| Yankee Doodle | Cannarado Genetics | - | unknown | feminized |
| Yard Trout | Calyx Bros. Seed Co. | 60 | indica / sativa | regular |
| Yarkoum | Tiki Seedbank | 53 | mostly indica | regular |
| Yeah Buddy | Dman Seeds | 67 | mostly sativa | regular |
| Yellow Cab | Top Dawg Seeds | - | unknown | regular |
| Yellow Gusher | UFO Genetics | 60 | mostly indica | regular |
| Yellow Melon | Dying Breed Seeds | - | unknown | regular |
| Yellow Snow | Archive Seed Bank | 63 | indica / sativa | regular |
| Yellowstone | The KushBrothers Seeds | 67 | mostly sativa | feminized |
| YEM OG | The Bank Genetics | 63 | mostly indica | feminized |
| Yemayá | Gure Brox Genetics | 67 | mostly indica | regular |
| Yemen Girl | Deluxe Seeds | 60 | indica / sativa | feminized |
| Yerba | Pacific NW Roots | 67 | indica / sativa | regular |
| Yerba Buena | Gage Green Genetics | 60 | mostly indica | regular |
| Yesno Kush | Noyes Boys Genetics | 65 | indica / sativa | feminized |
| Yeti | Sterquiliniis Seed Supply | 63 | ruderalis / indica / sativa | feminized |
| Yeti Cream Pie | Yetis Pheno | 70 | indica / sativa | regular |
| Yeti Dog | Loompa Farms | 68 | mostly indica | regular |
| Yeti F4 | Cultivated Choice Genetics | 65 | indica / sativa | regular |
| Yeti Fuel | Loompa Farms | - | unknown | Clone only |
| Yeti Invocation | SupraGenetics | 70 | indica / sativa | regular |
| Yeti Kush | Unknown or Legendary | - | mostly indica | regular |
| Yeti Meatloaf | Yetis Pheno | 70 | indica / sativa | regular |
| Yeti OG | Greenpoint Seeds | 67 | indica / sativa | regular |
| Yeti OG | Loompa Farms | 60 | mostly indica | regular |
| Yeti Wedding | Graysin Farms | 75 | ruderalis / indica | feminized |
| Yeti x G-13 | Bred by 42 | 63 | indica / sativa | regular |
| Yetis Breath 2.0 | Yetis Pheno | 60 | indica / sativa | regular |
| Yeyo | Ronin Garden | 65 | indica / sativa | feminized |
| Yikes | Exotic Genetix | 60 | mostly indica | feminized |
| Ymir | DwarvenForged | 65 | indica / sativa | feminized |
| Yo Hoe | Sincerely Cali | 62 | indica / sativa | regular |
| Yo Mama | Bodhi Seeds | 63 | mostly indica | regular |
| Yoda's Revenge | Life's Blood Seeds | 60 | mostly indica | regular |
| Yodana | Elev8 Seeds | - | mostly indica | feminized |
| Yoga Booty | Prairie State Genetix | 60 | mostly indica | regular |
| Yoga Pants | Evermore Genetics | 62 | mostly sativa | feminized |
| Yogi | Bodhi Seeds | - | mostly indica | regular |
| Yogurt | Forbidden Genetics | 45 | mostly indica | regular |
| Yogurt Dip | Bloom Seed Co | - | indica / sativa | regular |
| Yogurt Sorbet | Swordzman | 63 | indica / sativa | regular |
| YOINK! | Happy Little Treez | 65 | mostly indica | regular |
| Yokiri | Namek Gen8x | 70 | indica / sativa | regular |
| Yokozuna | Flip Side | 63 | indica / sativa | regular |
| Yonder Kush | Crescendo Genetics | 65 | mostly indica | feminized |
| Yonder Valley | Crescendo Genetics | 60 | mostly indica | regular |
| Yoni | Sticky Fangers Genetics | 56 | indica / sativa | regular |
| Yorker | Southern Star Seeds | 63 | mostly indica | regular |
| Yoruba Bontu Nigerian x OG | Apothecary Genetics | 77 | mostly sativa | regular |
| Yorubas Gold | 517 Legend Seed Co | 90 | sativa | regular |
| Yosemite Glue | Motherlode Seeds | 67 | mostly indica | regular |
| Yosemite Jam | Happy Bird Seeds | 85 | ruderalis / indica / sativa | feminized |
| Yours Truly | Pacific NW Roots | 65 | unknown | regular |
| Yours Truly | Annunaki Genetics | 63 | unknown | feminized |
| Youth In Asia | Swamp Boys Seeds | 63 | unknown | regular |
| Yuck Mouth | Archive Seed Bank | 65 | indica / sativa | feminized |
| Yuhbary | Anesia Seeds | 67 | mostly sativa | feminized |
| Yuki Dog | Massive Seeds | - | indica / sativa | regular |
| Yuki Soda | Nugs 420 | 60 | indica / sativa | regular |
| Yuki Sour Diesel | Massive Seeds | 61 | unknown | regular |
| Yum Yum Bud | Jaws Gear | 62 | mostly indica | regular |
| Yumbolt | CBD Seeds | 63 | indica | feminized |
| Yumbolt | Philosopher Seeds | 58 | indica | feminized |
| Yumbolt | Sagarmatha Seeds | 60 | mostly indica | reg. and fem. |
| Yumbolt 47 | World of Seeds Bank | 56 | mostly indica | feminized |
| Yumbolt x Vintage 2006 | CH9 Female Seeds | 49 | mostly indica | feminized |
| Yumm Yum | Envy Genetics | 61 | unknown | regular |
| Yummy | Resin Seeds | 67 | mostly sativa | reg. and fem. |
| Yummy Glue | BSV Genetics | 58 | indica / sativa | feminized |
| Yummy Yums | 808 Genetics | 67 | unknown | regular |
| Yunnan Dragon | Dragons Flame Genetics | 80 | mostly sativa | regular |
| Yuzu | Calyx Bros. Seed Co. | 60 | mostly sativa | regular |
| Yuzu Sour | Tastebudz Seeds | 77 | ruderalis / indica / sativa | feminized |
| Yuzu Tangie | Massive Seeds | - | indica / sativa | regular |
| YvorY | Clone Only Strains | 50 | mostly indica | Clone only |
| Yzer Kush V2 | Motarebel | 68 | mostly indica | regular |