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Sour Jack
Feminized
Sour Jack blends Sour Diesel and Jack Herer genetics for a bright, energetic smoke. THC averages 18 to 24 percent and CBD stays under 1 percent. Plants flower in 8 to 10 weeks and yield 400 to 500 g per square metre indoors. Train early with topping and LST to control stretch and improve canopy. MasterSeeds offers feminized packs suited to home growers and small commercial runs in Canada.
- Sour, Citrus, Uplifting
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STRAIN PROFILE
Complete Cannabis Strain Specifications
| Trait | Value |
|---|---|
| Type | Sativa-dominant hybrid |
| THC | 18-24% |
| CBD | <1% |
| Grow Difficulty | Intermediate |
| Flowering Time | 8-10 |
| Yield | Medium-High (400-500 g/m² indoor) |
| Height | Medium (80-140 cm indoor; up to 2.5 m outdoor) |
| Environment | Indoor/Outdoor |
| Effects | Uplifting, Energetic, Focused |
| Flavors | Sour citrus, Diesel, Pine |
| Genetics | Sour Diesel x Jack Herer |
| Climate | Temperate to Mediterranean |
Sour Jack Strain Information and Characteristics
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Strain Type:
Sour Jack is a sativa-dominant hybrid with an energetic profile. Growers in Canada prize it for daytime use.
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THC Content:
Average THC sits between 18% and 24% in well-grown runs. Expect top phenotypes to reach the higher end under strong light.
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CBD Content:
CBD remains low at under 1% across typical phenotypes. Patients look to it for mood support rather than heavy CBD therapy.
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Grow Difficulty:
This strain fits intermediate growers who manage stretch and nutrient needs. You must control training and feeding to hit top yields.
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Flowering Time:
Indoor flowering runs 8 to 10 weeks on average. Outdoor plants finish by late September in temperate zones.
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Expected Yield:
Indoor yields range 400 to 500 g per square metre under strong LED. Outdoor plants often deliver 400 to 600 g per plant in long seasons.
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Plant Height:
Plants stay medium tall indoors at 80 to 140 cm. Outdoor specimens often stretch up to 2.5 m in full sun.
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Growing Environment:
Sour Jack suits both indoor tents and outdoor plots. Give it room and training if you grow it outside.
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Expected Effects:
Expect an uplifting mental rush with steady energy and focus. The effect pairs well with daytime tasks and social settings.
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Genetic Lineage:
Genetics trace directly to Sour Diesel x Jack Herer for diesel funk and sativa lift. The cross emphasizes terpene-driven aroma and cerebral drive.
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Seed Type:
These seeds come feminized for predictable female plants and stable pheno runs. MasterSeeds lists small pack options for home growers in Canada.
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Preferred Climate:
Sour Jack prefers temperate to Mediterranean climates with warm days and cool nights. It tolerates brief cool spells but thrives with steady heat.
Frequently Ask Questions
Everything you need to know about this strain.
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Questions & Answers
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Q: How do I control Sour Jack stretch?
A: Topping at 3 to 4 nodes and LST before the main stretch keeps height in check.
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Q: What light schedule works best indoors?
A: Use 18/6 for veg and switch to 12/12 for flowering. Strong LED at 600 to 1000 µmol/m² helps resin and terpene production.
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Q: Which soil or medium do you recommend?
A: Use a well-draining soil with added perlite or a coco mix for faster uptake and easier pH control.
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Q: How do I push resin and aroma?
A: Finish with slightly cooler nights during the last two weeks and avoid heavy flushes that strip terpenes.
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Q: How do I prevent mould on dense colas?
A: Increase side-to-side airflow, lower humidity below 50% in late flower and remove inner fan leaves to improve penetration.
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