The Official Cannabis Independent strain guides
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The Official Cannabis collection · sheet 63No 63 · GMO CookiesGrow

Growing

Growing GMO Cookies: flowering time, yield and breeder specs

Leafly gives GMO Cookies a flowering time of 8–9 weeks; seed versions run from about 61 days (Mamiko Seeds, per SeedFinder) to 75–80 days (Barney’s Farm’s GMO), and High Times advised taking it down at around 70 to 74 days.1,2,3,4 Sources disagree sharply on difficulty, from easy (Zamnesia) to hard (Leafly).1,5

Breeder specs side by side

Source and versionFloweringIndoor yieldOutdoorDifficulty
Barney’s Farm, GMO, feminized75–80 days550–650 g/m²; 100–120 cm1,500 g per plant; 150–200 cm; 3rd–4th week of October3—
Barney’s Farm, GMO Cookies and Garlic Cookies, feminized63–70 daysUp to 600 g/m²; 100–120 cmUp to 1,500 g per plant; 150–250 cm; 2nd–3rd week of October6,7—
Barney’s Farm, GMO Auto (GMO × BF Super Auto #1)70–75 days seed to harvest500–600 g/m²; 90–110 cm230–300 g per plant; 100–130 cm8—
Zamnesia, GMO Cookies, feminized9–10 weeksUp to 500 g/m²; 100 cmUp to 650 g per plant; 180 cm; early October5Easy5
Dr. Blaze, GMO (S1), feminized9–10 weeksHigh (no figure published)9—Intermediate9
Mamiko Seeds, GMO Cookies, feminized (per SeedFinder)About 61 days2———
Prime Cuts Nursery, clone9–10 weeks450–600 g/m²; 3–5 ft600–1,500 g per plant10Moderate to difficult10
Leafly (strain page)8–9 weeksMedium; short to medium height1—Hard1

Seed-company and nursery figures are the sellers’ own claims, and seed versions are not the original cut.

What the plant is like

Expect chunky, resinous flowers. Weedmaps describes buds that grow long and chunky rather than perfectly round, green to purple, with orange pistils and a thick coat of trichomes; Leafly describes light green, spade-shaped buds dusted with white trichomes, and GreenState olive green buds drenched in trichomes.1,11,12 High Times wrote in 2017 that it yields heavy, tests high, gives great returns on hash and has strong bud structure.4 Its finder named it partly for how oddly it grew, Leafly reports.13

What to watch for

Difficulty is the disputed part: Leafly rates it hard, Prime Cuts Nursery moderate to difficult, Weedmaps moderately difficult, Dr. Blaze intermediate and Zamnesia easy, and GreenState found one source calling it very difficult and another somewhat easy.1,5,9,10,11,12 Timing is the other variable, since versions sold under the names finish anywhere from about 61 to 80 days.2,3 And expect a strong smell in the grow room: Prime Cuts describes an immediate, room-filling hit of garlic and diesel.10

Seeds and the law in the US

Under the amended federal definition of hemp, viable seeds from cannabis plants above 0.3% total THC, including THCA, are not hemp.14 Congress delayed that exclusion, with most of the new definition, from Nov 12 to Dec 11, 2026; only the exclusion of products with cannabinoids the plant cannot produce naturally starts on Nov 12.15 Home cultivation rules are set by each state. This site does not sell seeds.

Sources

  1. Leafly, GMO Cookies (aka Garlic Cookies, GMO Garlic Cookies) strain information. Accessed Oct 4, 2026.
  2. SeedFinder, GMO Cookies (Mamiko Seeds): strain info and breeder description. Accessed Oct 4, 2026.
  3. Barney’s Farm, GMO (aka Garlic Cookies) feminized seeds. Accessed Oct 4, 2026.
  4. High Times, The 10 best weed strains of 2018: GMO Cookies (Danny Danko and T.H. Caeczar) (2017-12-07). Accessed Oct 4, 2026.
  5. Zamnesia, GMO Cookies (Zamnesia Seeds) feminized. Accessed Oct 4, 2026.
  6. Barney’s Farm, GMO Cookies feminized seeds. Accessed Oct 4, 2026.
  7. Barney’s Farm, Garlic Cookies feminized seeds. Accessed Oct 4, 2026.
  8. Barney’s Farm, GMO Auto. Accessed Oct 4, 2026.
  9. Seeds Here Now, Dr. Blaze GMO feminized seeds (5-pack). Accessed Oct 4, 2026.
  10. Prime Cuts Nursery, GMO strain: grow guide and genetics. Accessed Oct 4, 2026.
  11. Weedmaps, GMO Cookies (aka Garlic Mushroom Onion) strain page. Accessed Oct 4, 2026.
  12. GreenState, GMO strain: a feast for the senses (Rachelle Gordon) (2023-10-08). Accessed Oct 4, 2026.
  13. Leafly, Get funky with GMO Cookies: August’s Leafly HighLight (David Downs) (2022-08-01). Accessed Oct 4, 2026.
  14. Congressional Research Service, Changes to the statutory definition of hemp and implications for agricultural policy (IF13136) (2026-09-28). Accessed Oct 4, 2026.
  15. U.S. Government Publishing Office, Continuing Appropriations and Extensions Act, 2027 (P.L. 119-103), sec. 2019. Accessed Oct 4, 2026.