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Sour Jack

Feminized

Sour Jack is a sativa-dominant hybrid known for its uplifting, focused high and citrus-diesel flavour.

Why choose Sour Jack?
  • Clear, focused daytime high
  • Citrus-diesel flavour with pine undertones
  • Performs reliably under LED setups
THC 18-23%
CBD 0.1-1%
Lineage Sour Diesel x Jack Herer
Genotype Sativa-dominant hybrid
Difficulty Intermediate
Flowering 8-10 weeks
Height Medium (80-130 cm indoors)
Yield Medium-High (approx. 400-500 g/m² indoor)
Taste Citrus, Earthy, Pine
Seed Type Feminized
Climate Variable British weather
Effects Uplifting, Focused, Energetic
Environment 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.

Grow Difficulty:

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 Time:

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.

Yield:

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.

Height:

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.

Environment:

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.

Climate:

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.

Frequently Asked Questions

Common questions about this strain, covering growth, effects, and suitability for UK conditions.

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Choose seed quantity
Selected: 5 Seeds
£53.33 £40.00
£8.00 / seed • You save £13.33
Accepted payment methods
100% Satisfaction Guarantee • Secured Payments
Urbanseedbank Support

Questions & Answers

Customer questions and answers from the Urbanseedbank team. Submit your own question and we’ll respond after review.

5 questions Answered posts are shown first.
Common question Posted by Urbanseedbank Answered
Q
What pot size should I use indoors?
A
Verified answer
Use 7–11 litre pots for one plant to give roots room without wasting space; larger pots suit longer veg periods.
Common question Posted by Urbanseedbank Answered
Q
When is the best time to top my Sour Jack seedlings?
A
Verified answer
Top after 4–6 nodes in veg to encourage a bushier structure and even canopy for LED setups.
Common question Posted by Urbanseedbank Answered
Q
How often should I water under LED lights?
A
Verified answer
Water as needed when the top 2–3 cm of medium is dry; frequency depends on pot size, medium and canopy density.
Common question Posted by Urbanseedbank Answered
Q
Any tips to avoid bud rot in York's damp autumn?
A
Verified answer
Increase airflow, leave some lower foliage removed for ventilation and consider an early harvest if weather turns persistently wet.
Common question Posted by Urbanseedbank Answered
Q
Do I need to adjust nutrient strength under LEDs?
A
Verified answer
Start at 70% of recommended feed and increase gradually; LEDs often require lower initial EC due to efficient light uptake.

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