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10K Jack

Feminised

10K Jack is a sativa-dominant hybrid that offers an uplifting, focused high and a citrus-forward flavour. It suits growers who want medium-high yields and clear daytime effects.

Why choose 10K Jack?
  • Uplifting daytime strain
  • Bright citrus aroma
  • Reliable greenhouse performer
THC 22-26%
CBD 0.5-1%
Lineage 10K x Jack Herer
Genotype Sativa-dominant Hybrid
Difficulty Intermediate
Flowering 9-10 weeks
Height Tall (100-160 cm)
Yield Medium-High (approx 450-550 g/m² indoor)
Taste Citrus, Pine, Earthy
Seed Type Feminised
Climate Mild Maritime; Greenhouse Friendly
Effects Uplifting, Creative, Energetic
Environment Indoor & Outdoor

About 10K Jack

10K Jack is a sativa-dominant hybrid bred from 10K x Jack Herer that delivers bright citrus notes and an energetic, focused high. If you grow it indoors you will need headroom and a plan for training to manage its stretch. Outdoors it performs well in sheltered spots or under greenhouse cover where damp UK weather is less of a threat. The strain flowers in about 9-10 weeks and yields are medium-high with attentive feeding and airflow. Trichome production is strong, so expect sticky, resinous buds that respond well to a slow dry and thorough cure. If you grow in Cornwall or Kent a greenhouse helps ripen the crop; in cooler regions use a longer veg cycle and robust training to get the best results.

Grow Difficulty:

Overall difficulty rates as intermediate and rewards steady attention to feeding and environment. UK humidity means you should prioritise ventilation in greenhouse setups.

Flowering Time:

Flowering runs about 9-10 weeks under controlled indoor lights. Outdoors in the UK this generally fits the summer window if you use a sheltered site or a greenhouse.

Yield:

Yields are medium-high with around 450-550 g/m² achievable indoors under good conditions. Outdoor growers in southern England and Wales report reliable harvests with proper shelter by late September.

Height:

Plants stretch tall and suit growers who have good vertical space in tents or greenhouses. If you grow indoors in a compact set-up in Leeds or Bristol you should train early to control height.

Environment:

10K Jack performs well both indoors and outdoors with a preference for protected outdoor spots. In damp British summers a greenhouse helps prevent mould and improves bud finish.

Climate:

Best climate is the UK-style mild maritime weather with warm summers and rainy autumns. Outdoors favour sheltered sites in Cornwall while greenhouse setups help extend the season in the Scottish Highlands.

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
My 10K Jack plants stretched too high. Any quick tips?
A
Verified answer
Top at three to five nodes and start LST early to limit vertical growth. Tie branches down and open the canopy to keep colas even.
Common question Posted by Urbanseedbank Answered
Q
I spotted grey mould outdoors in Liverpool. What should I do?
A
Verified answer
Remove damaged buds and improve airflow around plants immediately. Move future crops under a greenhouse or cut the season short if rain stays heavy.
Common question Posted by Urbanseedbank Answered
Q
How strong is the high from 10K Jack?
A
Verified answer
It gives an uplifting, focused high that suits daytime use. Expect clarity rather than heavy sedation.
Common question Posted by Urbanseedbank Answered
Q
Which bloom nutrients work best?
A
Verified answer
Switch to a bloom formula with higher phosphorus and potassium after week three of flower. Keep nitrogen moderate to avoid leaf stretch late in the cycle.
Common question Posted by Urbanseedbank Answered
Q
Any final tips to boost flavour?
A
Verified answer
Perform a two-week flush before harvest and dry slowly at stable temperature and humidity. Cure for at least four weeks to get full flavour development.

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