How to Grow GMO
GMO is a potent, heavily indica-dominant feminized strain that crosses Chemdog with Girl Scout Cookies. It is a 90/10 indica with a high 26-28% THC, a savory coffee, earthy, fruity and sweet flavor, and a euphoric, relaxed effect. It pairs big yields with a deep, pungent profile and real potency, making it a rewarding strain to grow indoors or out.
As a feminized photoperiod strain, GMO lets you control the grow: you keep it in vegetative growth under long days for as long as you like, then switch the lights to trigger flowering. It finishes flowering in about 8 to 10 weeks, and outdoors it is ready to harvest in October, giving you a flexible, high-yielding plant with a rich, savory-sweet character.
Recommended Strains
GMO
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THC | 26% - 28% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 90% Indica / 10% Sativa |
GMO Cookies
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THC | 18% - 22% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 70% Indica / 30% Sativa |
Potent, heavy-yielding and beginner-friendly, GMO is a rewarding strain to grow. You can see the full genetics and buy GMO seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | High (26-28%) |
|---|---|
| Lineage | Chemdog x Girl Scout Cookies |
| Type | Feminized |
| Genetics | 90% Indica / 10% Sativa |
| Climate | Tropical |
| Flowering time | 8-10 weeks |
| Harvest | October (outdoors) |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.31-1.64 oz/ft² (400-500 g/m²) |
| Yield outdoor | 28.22-42.33 oz/plant (800-1200 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Coffee, Earthy, Fruity, Sweet |
| Effects | Euphoric, Relaxed, Mellow |
Promos & Deals
Vegetative Growth and Flipping to Flower
GMO is a feminized photoperiod strain, so it flowers in response to the light cycle rather than on its own schedule. You keep it in vegetative growth under long days, usually 18 hours of light to 6 of darkness, for as long as you want to build its size and structure. Because this strain is such a heavy producer, a strong, healthy veg is where those big yields are built, so give it room, healthy roots and steady feeding.
When the plant is the size you want, you flip the lights to a 12/12 cycle, 12 hours of light and 12 of darkness, to trigger flowering. From that point it takes about 8 to 10 weeks to finish. It stays around 1.5 m and responds very well to training: topping and low-stress training during veg open the canopy, spread the bud sites and help this productive, indica-heavy plant reach its full potential.
Climate and Where to Grow It
GMO suits a warm, tropical climate and grows well both indoors and outdoors where it gets strong light and plenty of warmth. Because it is a photoperiod plant, outdoor growers should time it so it finishes in October, while indoor growers can run it year-round under a controlled light cycle. Its compact 1.5 m frame hides just how productive it is, so give it good light and feeding to unlock its yields.
Its high 26-28% THC places it firmly among our high-THC seeds, and its compact, heavily indica-dominant structure sits naturally in our indica seeds. Its genuine cookie and Chem heritage places it among our kush strains, and you can explore both parents directly through the Chemdog #4 and Girl Scout Cookies pages.
On yield it is a heavy producer, giving around 400-500 g/m² indoors and a large 800-1200 g per plant outdoors, so with good light and feeding the reward is big. One thing to watch in a humid, tropical setting is its dense, resinous buds: keep the air moving and humidity in check through flowering so those tight colas ripen clean and stay free of problems.
Feeding Schedule (EC Guide)
GMO is a vigorous, heavy-yielding plant that can take a moderate to full feed, but build up gradually rather than pushing it from the start. Feed it steadily through veg, shift toward bloom nutrients as it starts flowering, then flush at the end so the coffee, earthy, fruity and sweet notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.5-0.7 | Light feed while roots establish |
| Vegetative | 1.2-1.6 | Build nitrogen as the plant grows |
| Early flower | 1.6-1.9 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.8-2.2 | Peak bloom feed for heavy buds |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once flipped to 12/12, GMO flowers for about 8 to 10 weeks, and outdoors it is ready around October. It builds dense, frosty, resin-coated buds that develop a pungent, savory aroma of coffee and earth over a fruity, sweet base as they ripen. That deep, savory-sweet scent and heavy frost are the signature of its Chemdog and Girl Scout Cookies heritage, and the resin it packs on is one of its calling cards.
Yields are heavy, around 400-500 g/m² indoors and 800-1200 g per plant outdoors on a well-grown specimen, so there is real weight here alongside the potency. Keep the dense colas supported and the canopy open so light reaches the lower sites, feed it well through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest coffee, earthy flavor and the most rounded effect.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry matters with such dense, resinous buds, because they can stay damp in the middle while the outside dries, and a gentle dry protects the coffee, earthy, fruity and sweet aroma that defines the strain.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the full coffee, earthy and sweet character and smooths the smoke, turning a freshly dried harvest into the rich, savory result GMO is known for.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. GMO is a very resinous plant, so its trim is excellent for dry sift, bubble hash or rosin. That heavy resin and its savory, coffee aroma make the trim genuinely valuable, turning offcuts into a potent, flavorful concentrate run rather than waste, and with yields this big there is plenty of trim to work with.
Flavor and Terpenes
GMO leads with a pungent, savory profile: coffee and earth up front over a fruity, sweet base, the deep character it inherits from its Chemdog and Girl Scout Cookies parents. It is a full-bodied, complex smoke, and a good cure brings that coffee-earthy character forward in the jar and on the inhale, with the fruity, sweet notes rounding it out.
Its terpene profile frames that flavor. Caryophyllene adds a peppery, spicy warmth that drives the savory side, while myrcene brings a soft, earthy, musky base underneath. Humulene lends an earthy, hoppy depth, alpha-pinene a fresh lift, and terpinolene and linalool round it out with fruity and soft, gentle notes. Together they build the complex, coffee-earthy-fruity frame that makes GMO so distinctive.
Effects and Best Use
With its high 26-28% THC and heavily indica-dominant 90/10 make-up, GMO delivers a potent, deeply physical experience. It is reported as euphoric, relaxed and mellow, pairing a bright, upbeat lift with a heavy, settled body that leans well into the indica side. The potency is genuinely high, so a measured dose goes a long way, especially for newer smokers who may prefer to start slow.
That euphoric, relaxed, mellow profile makes it a natural choice for the evening or a quiet day off, well matched to its savory, coffee flavor. The combination of real potency, a deep, complex taste and heavy yields is exactly why GMO stands out among high-THC, indica-dominant strains.
Common Problems and Pro Tips
GMO is forgiving and beginner-friendly, but its dense buds and tropical preference ask for good environmental control. In a warm, humid setting those tight, resinous colas can trap moisture, so keep the air moving, run a dehumidifier if you need to, and ease the humidity down through flowering to keep the heart of the bud clean. Airflow is your best friend with a plant this frosty and productive.
Training pays off here: because it stays compact, topping and low-stress training during veg open the canopy and spread the heavy flowering sites, which on such a productive plant adds up to a much bigger, more even harvest. Support the dense colas as they fill out so the branches do not strain under the weight, and give the lower bud sites enough light to ripen evenly.
As a pro tip, feed it well through veg and early flower to fuel those big yields, then flush properly at the end so the coffee, earthy and sweet notes come through clean. Protect the terpenes with a full three to four week cure, save the resinous trim for concentrates, and harvest when most trichomes are cloudy with a few amber for a rich, flavorful result.
FAQ
Is GMO a feminized strain?
Yes. GMO is a feminized photoperiod strain, so it produces female plants and flowers in response to the light cycle. You keep it under long days to grow its size, then flip the lights to a 12/12 cycle to start flowering. That control lets you dial in exactly how big the plant gets before it blooms, which matters for such a productive strain.
How much THC does GMO have?
GMO is a potent, high-THC strain, testing from about 26% up to 28% depending on the phenotype and how it is grown. Combined with its heavily indica-dominant 90/10 genetics, the result is a euphoric, relaxed, mellow effect with a deep body. It is well worth dosing carefully if you are newer to strong strains, since the potency is genuinely high.
How much does GMO yield?
GMO is a heavy producer, giving around 400-500 g/m² indoors and a large 800-1200 g per plant outdoors. To reach those numbers, give it strong light, a steady feed and good support for the dense colas. Training it during veg spreads the canopy and helps this indica-heavy plant push its harvest higher still.
How long does GMO take to flower?
Once you flip it to a 12/12 light cycle, GMO flowers for about 8 to 10 weeks before it is ready to harvest. Outdoors, it finishes around October. Because it is a photoperiod plant, you control the vegetative stage, so you can grow it to the size you want before switching the lights to begin flowering.
What does GMO taste like?
It has a pungent, savory flavor of coffee and earth over a fruity, sweet base, the profile it gets from Chemdog and Girl Scout Cookies. Caryophyllene adds a peppery warmth, myrcene an earthy base, humulene a hoppy depth and terpinolene a fruity lift. A proper three to four week cure brings that complex, coffee-earthy character forward on the inhale.
Is GMO indica or sativa?
GMO is heavily indica-dominant, at a 90/10 split, so it grows as a compact, sturdy plant with dense, resinous buds, staying manageable at around 1.5 m and finishing in about 8 to 10 weeks of flowering. That balance shows in its euphoric, relaxed, mellow effect, which pairs an upbeat head with a deep, settled body.
