Fatso is an indica-dominant hybrid from Cannarado Genetics, the Colorado breeder Seedfinder traces back to the late 1990s. It crosses GMO with Legend OG, and genetics supplier Refined Genetics credits the release to Cannarado and Phinest together.
Its headline number is potency. Leafly lists Fatso at 28% THC with a 4.7 rating across 120 reviews, and Phinest's genetic library puts it at 28–30% and above.
GMO Cookies meets Legend OG
The GMO side is GMO Cookies, also sold as Garlic Cookies. Leafly credits Mamiko Seeds with the original cross of Girl Scout Cookies and Chemdawg, an indica-dominant hybrid that finishes in 8–9 weeks and tests around 28% THC.
Legend OG brings the OG Kush line. Leafly lists it as an indica bred from OG Kush and an unnamed partner, with 23% THC and 1% CBG, and it has already parented cultivars such as I-95 and GMOG. Leafly sums up Fatso as a newer strain that caters to gas, Kush and Cookies fans alike.
The flavor follows the GMO parent. Leafly reviewers describe ammonia, diesel and pungent notes, and Refined Genetics lists β-caryophyllene, limonene and myrcene as the dominant terpenes.
Tall, stretchy and built to yield
Fatso grows fast. Refined Genetics describes vigorous vegetative growth with larger internodal spacing and weaker than average branching. Stretch is high once flowering starts, so the canopy needs strong support before the flip to bloom.
Flowering runs 60–80 days in Phinest's listing, with Refined Genetics giving 70–80 days depending on environment. Seedfinder puts indoor yields near 500 g/m² and outdoor plants near 550 g each, and notes the plant takes well to topping and low-stress training. It also calls for stakes or nets to hold up the heavy flowers late in bloom.
Refined Genetics and Phinest both rate it a strong yielder with intermediate resistance to botrytis and powdery mildew. It prefers temperate climates over extremely hot, dry conditions. Seedfinder lists feminized seeds only, with clones available through Phinest.
A resin plant that washes well
Fatso's biggest selling point for extractors is its trichome load. Leafly calls it covered in trichomes and great for hash, and Phinest tags it as a washer. Refined Genetics reports solventless hash returns above 5%. Phinest adds that the plant puts its energy into producing sticky, resinous flowers.
That washing ability puts Fatso in the extract case as well as the flower jar, where it appears as a Fatso concentrate. Seedfinder lists total cannabinoids at 28–30%, in line with the flower numbers from Leafly and Phinest.
Phinest's library files Fatso under classic, gas, high-yield and mold-resistant tags, the traits a commercial grower looks for when choosing a cut.
Cannarado and Phinest's shared catalog
Fatso is one of several cultivars tied to both names. Phinest's library also credits Cannarado on Carbon Fiber, a Biscotti, Cookies N' Cream and Grape Pie cross released as an indica-dominant hybrid.
The effect lands heavy. Leafly reviewers most often report feeling sleepy, relaxed and tingly, and Phinest describes a comfortable body high suited to the end of the night.