
- Sativa-dominant, Uplifting, Flavourful
10K Jack
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.
- Uplifting daytime strain
- Bright citrus aroma
- Reliable greenhouse performer
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22-26% |
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0.5-1% |
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10K x Jack Herer |
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Sativa-dominant Hybrid |
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Intermediate |
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9-10 weeks |
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Tall (100-160 cm) |
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Medium-High (approx 450-550 g/m² indoor) |
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Citrus, Pine, Earthy |
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Feminised |
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Mild Maritime; Greenhouse Friendly |
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Uplifting, Creative, Energetic |
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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.
10K Jack is a sativa-dominant hybrid that leans on classic Jack Herer drive. Many UK growers will recognise its daytime focus and lively growth.
THC sits around 22-26% which gives a solid, energetic high without overwhelming most users. That potency lines it up with other strong daytime strains popular among British collectors.
CBD content is low at roughly 0.5-1% so effects stay THC-led and clear-headed. British wellness shoppers often look elsewhere for high CBD, but some growers keep 10K Jack for mood support.
The genetics read 10K x Jack Herer which gives a clear sativa drive with resinous trichome production. That cross emphasises energetic effects and a citrus-forward terpene mix.
These seeds are feminized which suits growers who want predictable female plants in limited space. British collectors often choose feminized lines for ease of planning in small grows around London or Newcastle.
Overall difficulty rates as intermediate and rewards steady attention to feeding and environment. UK humidity means you should prioritise ventilation in greenhouse setups.
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.
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.
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.
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.
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.
Effects are uplifting, focused and energetic which suits daytime use and creative work. UK users who favour clear-headed effects will often pick 10K Jack for social or active hours.
Flavours show bright citrus top notes, pine and a solid earthy base that develops with curing. You will notice a peppery aftertaste that brings balance to the citrus profile.
Frequently Asked Questions
Common questions about this strain, covering growth, effects, and suitability for UK conditions.
Place seeds in a damp paper towel or seed compost at room temperature and keep them humid until the taproot appears. Move sprouts into small pots with light soil and give gentle light until true leaves form.
Start with a balanced vegetative feed and increase nitrogen for veg growth. Switch to a bloom programme at the start of flowering and raise phosphorus and potassium moderately.
Low stress training and topping work well to control stretch and open the canopy. Tie down branches and remove lower growth to focus energy on main colas.
Keep good airflow, moderate humidity and avoid overcrowding plants. Use a greenhouse or move plants undercover during prolonged rain to limit grey mould risk.
Harvest when most trichomes appear cloudy with some amber visible using a loupe. In southern England aim for late September while northern locations may reach readiness slightly later.
Dry slowly in a dark, ventilated room at about 18-21°C and 45-55% humidity. Cure trimmed buds in glass jars, opening daily for a few minutes during the first two weeks, then store cool and dark.
Yes if you use aggressive LST and topping to limit vertical growth. Keep nutrient cycles tight and remove lower shading growth to maintain airflow.
Expect sharp citrus up front, resinous pine underneath and an earthy, peppery finish. A longer cure will bring sweeter citrus notes to the fore.
Both systems perform well; soil gives forgiving margins for wetter UK weather while hydro offers faster growth under stable indoor conditions. Choose the system that fits your experience and environment.
Plan roughly 12-14 weeks from seed when you include a standard vegetative period before switching to flowering. Autoflower forms are not the usual version of this line and will have a different timetable.
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