
- Uplifting energy with a sharp citrus kick
Sour Jack
Sour Jack is a sativa-dominant hybrid known for its uplifting, focused high and citrus-diesel flavour.
- Clear, focused daytime high
- Citrus-diesel flavour with pine undertones
- Performs reliably under LED setups
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18-23% |
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0.1-1% |
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Sour Diesel x Jack Herer |
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Sativa-dominant hybrid |
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Intermediate |
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8-10 weeks |
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Medium (80-130 cm indoors) |
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Medium-High (approx. 400-500 g/m² indoor) |
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Citrus, Earthy, Pine |
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Feminized |
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Variable British weather |
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Uplifting, Focused, Energetic |
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Both; prefers controlled indoor environments but tolerates outdoor grows |
About Sour Jack
Sour Jack is a sativa-leaning hybrid bred from Sour Diesel and Jack Herer that delivers a clear, energetic high. It offers citrus and pine notes over an earthy base and performs very well indoors under controlled conditions, rewarding growers who manage humidity and airflow carefully.
Sour Jack is a sativa-dominant hybrid with a lean towards cerebral effects. It combines stimulating clarity with enough body grounding for daytime use.
THC typically sits between 18 and 23 percent, offering a reliably potent experience. Growers in York can expect buds that produce a clear, energetic high without heavy sedation.
CBD levels are low, generally under 1 percent, so this is not a high-CBD therapy strain. Users seeking CBD-specific benefits should consider supplementing with other varieties.
The lineage blends Sour Diesel and Jack Herer, delivering pungent diesel notes and sativa clarity. Those parent strains explain its fast-paced, cerebral character.
Seeds are available feminised to simplify canopy uniformity and flowering predictability. Growers should still select strong phenotypes for best results.
Cultivation is intermediate and rewards attention to feeding and airflow under variable British weather. Expect to manage humidity and temperature carefully, especially if you move plants outdoors during summer in the UK.
Flowering completes in around eight to ten weeks under a 12/12 light schedule. Outdoor growers in York should aim to harvest before autumn rains increase the risk of mould.
Yields are medium to high when trained and fed correctly, with indoor runs reaching roughly 400–500 g/m². Outdoor results depend heavily on season length and shelter from persistent damp.
Plants stay reasonably compact indoors, typically between 80 and 130 cm with standard training. Outdoors they can stretch more, so plan trellising if space is limited.
Sour Jack performs very well indoors under consistent conditions and controlled humidity in York. It will also produce outdoors but needs a dry late summer to finish cleanly in York gardens.
Growing Sour Jack in York requires planning for the variable British weather and potential late-season damp. Give plants good airflow and consider early shelter options to avoid mould during wet periods.
The high is uplifting and clear, promoting focus and creativity rather than couch-lock. Users report a steady energy that suits daytime tasks and social situations.
The flavour profile mixes sharp citrus top notes with an earthy, pine base. Terpene-driven citrus and pine linger on the exhale without overwhelming sweetness.
Frequently Asked Questions
Common questions about this strain, covering growth, effects, and suitability for UK conditions.
Switch to a 12/12 light schedule to induce flowering and maintain consistent dark periods to avoid stress.
Keep humidity below 50% during late flowering and use fans and dehumidification where necessary to reduce mould risk.
Yes, low-stress training (LST) and topping control height and improve light penetration for higher yields.
Aim to harvest before the first persistent autumn rains, often late September to early October depending on local conditions.
Moderate to heavy feeding during vegetative and early flowering phases, tapering nutrients in the final two weeks to improve flavour.
Feminised seeds will flower under a 12/12 schedule indoors year-round, but outdoor grows depend on seasonal daylight in the UK.
Watch for spider mites, powdery mildew and bud rot; maintain cleanliness and good airflow to reduce infestations.
Yes, with training it fits well in small tents since it remains relatively compact indoors and responds well to canopy management.
Absolutely — indoor LED cannabis cultivation works very well with Sour Jack, providing efficient light spectrum and lower heat stress.
Flush with plain water for 7–14 days before harvest and reduce nitrogen in late flowering to enhance terpene clarity.
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