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Tips for growing GSC Cannabis

(digihelion/iStock)
This article is presented by Advanced Nutrients, a global company raising the bud weights and reputations of cannabis growers since 1999.


Strain overview: The famous GSC hybrid was created by crossing OG Kush and Durban Poison. Bred by the Cookie Fam in the Bay Area, the genetics have since reached markets nationwide. Consistently exhibiting high THC levels, GSC offers a high that is sedative and hard-hitting. Despite its wide proliferation, the hardest part about growing GSC might just be acquiring a clone for yourself.

Grow techniques: Its indica-dominant traits make it a prime candidate for SOG (sea of green) indoors in either a soil or hydro setup. By training the plants, you can easily maximize your grow space to its full potential. Keep the lower canopy pruned and have consistent airflow through the canopy to make sure you prevent powdery mildew from attacking your buds.

Flowering time: 9 to 10 weeks

Yield: Moderate. Train this strain to expose bud sites to sunlight while pruning everything else away to ensure the plant’s energy is focused on the buds that matter most.

Grow difficulty: Moderate

Climate: GSC will tolerate temperature fluctuations better than most strains, but prefers a mild and drier climate. Ideal temperature ranges between 68 and 80 degrees Fahrenheit. 

Indoor/outdoor: GSC will produce the best yields indoors or in greenhouses where training techniques can be maximized.

Feeding: Generally speaking, OG genetics will always want more calcium and magnesium nutrients. Pay attention to growth and signs of deficiencies.

cannabis feed chart

(Courtesy of Advanced Nutrients)

To learn more about feeding with Advanced Nutrients supplements, check out their online nutrient calculator or call their grower support line at 1-800-640-9605.
  • Sam Adams

    Does anybody have an idea of when GSC, Gelato, and PGSC finish outdoors? While we’re at it, Green Queen?

    • Mike Jager

      1st timer but i have lots of nice looking flowers in west michigan.I would follow the general guide lines and watch for your milky and amber colors

  • Nathaniel Baker

    This by far one of my favorite strains to grow. My experience has been excellent with GSC. I originally bought the seeds, but now I’m making my own feminized seeds from scratch(OG Kush x Durban Poison) SOG techniques are a must in order to get a decent yield, and I use a 2000w Bestva LED to veg. This plant loves water, cal / mag, be generous with it, other fertilizers are not as necessary. 1 -2 x a week is good until flowering.

  • PedroA

    These are a bitch to grow if you’re a newbie and that’s exactly what I was when I started with this strain as one of my first plants years ago. i find it to be far more Nitrogen & calmag hungry than a lot of other strains. It’s sensitive to pH issues, had one yellow it’s leaves overnight because the pH locked out the N more drastically than I could ever imagine. Get good genetics of this one, the cuts are the best but be wary of where they come from. Lots of people pass off crosses as GSC.

  • Michael Miller

    I have a couple of questions. I am an outdoor grower, use Foxfarm products and live in northern AZ. at 3500 ft. alt. My GSC’s are 8′, 7′, 6’and
    ft,’ and 3ft.tall witch is yellowy through and through. On the 6′ it has a branch of the stalk which is kind of deformed. It has small yellow leaves with small but bordering on green buds. What should I do with thisl What is puzzling is that one plant is that way but only a major branch of the 6′ is that way. The other 3 plants are healthy green with some fan leaves turning yellow and buds are forming nicely. About 2 more weeks for swelling of buds to occur and a couple of days of flushing. I guess I want advise on the early yellowing. Should I just cut the yellow branch system out? and what to do with the 3′ yellow plant.

    • Jesse Jansen

      You have to use foxfarm sledgehammer bro. The foxfarm salt fertilizers are amazing, however you have to use foxfarm sledgehammer to release the built up salts over time. If you do not use it, “Hello Nutrient Lockout”. IO use sledgehammer right before flower and 18 days before harvest. Then just stick with molasses after{since you are soil}. If you wanna use the foxfarm products with outstanding results then go to their website and look at their feeding schedule for hydro or soil or coco. But yup, you need the hammer bro that hammer is a shampoo for soil that shampoos and releases all the excess salts, mandatory.