How to Grow GSC x Sour Diesel
GSC x Sour Diesel crosses two all-time legends, Girl Scout Cookies and Sour Diesel, into a lively, sativa-leaning hybrid. It pairs a comfortable 15–20% THC with a citrus, diesel and pine flavour and a creative, energetic, happy effect, on a sturdy, easy-to-grow plant.
Built from Girl Scout Cookies crossed with Sour Diesel, this is a 55% sativa, 45% indica strain with a touch of CBD and the pungent, fuel-and-citrus nose you would expect from that pairing. The result is an uplifting, feel-good plant with a sharp, aromatic profile.
Recommended Strains
Sour Cookies
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THC | 15% - 20% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 45% Indica / 55% Sativa |
Girl Scout Cookies
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THC | 18% - 25% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 60% Indica / 40% Sativa |
Because it is vigorous, flavourful and forgiving, GSC x Sour Diesel is a rewarding grow at any level. You can see the full genetics and buy GSC x Sour Diesel feminized seeds on the strain page, and browse more of our feminized range alongside it.
Strain Profile at a Glance
| THC | 15–20% (medium) |
|---|---|
| Lineage | Girl Scout Cookies x Sour Diesel |
| Type | Feminized |
| Genetics | 55% Sativa / 45% Indica |
| CBD | 2% |
| Climate | Temperate |
| Flowering time | 8–10 weeks |
| Harvest | October |
| Height | 4.92 ft / 1.5 m |
| Yield | Medium |
| Yield indoor | 1.31 oz/ft² (400 g/m²) |
| Yield outdoor | 19.4 oz/plant (550 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Citrus, Diesel, Pine |
| Effects | Creative, Energetic, Happy |
Promos & Deals
Climate and Where to Grow It
GSC x Sour Diesel does well in a temperate climate with mild, steady conditions and plenty of light. It is a sturdy, adaptable plant that performs both outdoors and in a controlled indoor tent, settling at a moderate 1.5 m that suits most spaces.
Outdoors it finishes around October, with a single plant bringing in a solid 550 g in a good spot. Indoors it produces a steady 400 g/m². Its sativa side can add some stretch in early bloom, so give it a little headroom and keep humidity in check as the resinous buds fill in.
Indoors, aim for daytime temperatures around 68–80°F (20–27°C) and keep steady airflow moving through the canopy. The diesel-citrus aroma is punchy, so a carbon filter is worth having if discretion matters to you.
Growing Feminized Photoperiod Seeds
As a feminized strain, every seed grows into a flowering female, so there is no need to sex the plants or remove males. That keeps the grow simple and means no wasted time or space on plants you would only cull later.
Being a photoperiod plant, GSC x Sour Diesel flowers on a light change rather than on age. Grow it under a long day (around 18 hours of light) through the vegetative stage, then switch to a 12/12 cycle to trigger flowering. A shorter veg helps keep the sativa stretch in check for a compact indoor space.
Feeding Schedule (EC Guide)
This is a vigorous, productive plant, so you can feed it steadily through bloom to support the resinous buds. Start low, build up as the plant asks for more, and taper off for the final flush so the citrus-diesel flavour stays clean.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Build the frame, raise nitrogen gradually |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Flowering and Harvest
Once you flip to 12/12, bloom runs about 8–10 weeks. As a sativa-leaning hybrid, it stretches a little early in flower and then fills in with resinous, aromatic buds along the branches rather than one single heavy cola.
Keep the canopy open and support the longer branches if they start to lean. Harvest when most trichomes have turned cloudy with a few amber heads for the fullest expression, and run a short plain-water flush in the last week or two before you cut. Outdoor plants are usually ready around October.
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 stops the dense buds staying damp in the middle while the outside dries out, which protects the sharp, citrus-diesel aroma.
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 brings the citrus and pine notes forward over the diesel base and smooths the smoke, which is exactly what this legendary cross deserves.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. GSC x Sour Diesel is a frosty, resinous plant, so the trim is excellent for dry sift, bubble hash or rosin, giving you a bonus run of flavourful concentrate from material most growers throw away.
Flavor and Terpenes
GSC x Sour Diesel has a sharp, aromatic flavour of bright citrus and pungent diesel over a fresh, piney base, the unmistakable fuel-and-zest profile its two parents are famous for. It is a bold, lively taste rather than a sweet or creamy one.
It carries a broad terpene stack. Six shape the aroma: pinene drives the fresh pine note; terpinolene adds a bright, citrusy lift; caryophyllene brings the pungent, diesel-like warmth; myrcene anchors the earthy base; carene deepens the piney side; and geranyl acetate rounds it off with a floral-citrus note. A supporting cast of humulene, eucalyptol and linalool fills in the background.
Effects and Best Use
With its 55% sativa lean, GSC x Sour Diesel is reported as creative, energetic and happy, a bright, upbeat character that lifts the mood and keeps you going rather than weighing you down. The 2% CBD alongside the moderate THC adds to that smooth, clear-headed feel, making it a good daytime pick.
At a medium 15–20% THC it is approachable rather than overwhelming, which suits its beginner-friendly nature. That balance, the lively citrus-diesel flavour, the solid yield and the uplifting effect make it a genuinely rewarding grow.
FAQ
Is GSC x Sour Diesel indica or sativa?
It is sativa-leaning, at 55% sativa and 45% indica, so it tilts toward a bright, creative, energetic effect rather than heavy sedation. The small indica share still adds a little body balance, which makes it a well-rounded, upbeat hybrid that works nicely as a daytime strain.
How long does it take to flower?
About 8–10 weeks once you switch the lights to a 12/12 cycle, with outdoor plants finishing up around October. As a sativa-leaning hybrid it may sit at the longer end of that window, so watch the trichomes and harvest when most have turned cloudy with a few amber heads.
Do I need to sex the plants?
No. GSC x Sour Diesel is sold as feminized seeds, so every seed grows into a flowering female. There is no need to identify or remove males, which keeps the grow simple and means you waste no time, space or light on plants you would only end up culling later.
Is GSC x Sour Diesel good for beginners?
Yes. It is sturdy, forgiving and only a moderate 1.5 m, which makes it beginner-friendly. Keep the canopy open for airflow, rein in the early sativa stretch with a shorter veg if space is tight, and manage humidity in bloom, and it is a very straightforward plant to grow.
What does GSC x Sour Diesel taste like?
Expect a sharp, aromatic mix of bright citrus and pungent diesel over a fresh, piney base, the classic fuel-and-zest profile of its parents. Its pinene and carene carry the pine, terpinolene and geranyl acetate lift the citrus, and caryophyllene brings the diesel-like pungency underneath.
How much does it yield?
It is a medium producer: around 1.31 oz/ft² (400 g/m²) indoors, and about 19.4 oz (550 g) per plant outdoors in a good season. Give it plenty of light, a little headroom for the sativa stretch and a steady feed through bloom to get the most from it.
