Q
I'm seeing some yellowing tips under my LED; what now?
A
Check for light burn by raising the fixture slightly and confirm nutrient balance—reduce EC and observe for recovery over a few days.
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- Balanced power, reliable yields.
Black Jack
Feminised
Black Jack is an indica-dominant hybrid known for balanced cerebral lift and calm body effects, suited to growers who want consistent potency.
Why choose Black Jack?
- Resin-heavy buds with a clear-headed lift
- Responds very well to LED setups with stable canopy control
- Compact plants that reward routine training
THC |
18-22% |
CBD |
0.2-0.6% |
Lineage |
Black Domina x Jack Herer |
Genotype |
Indica-dominant hybrid |
Difficulty |
Moderate |
Flowering |
8-9 weeks |
Height |
80-150 cm |
Yield |
400-550 g/m² (indoor) |
Taste |
Earthy, Pine, Spicy Herbal |
Seed Type |
Feminised |
Climate |
Variable British Weather |
Effects |
Euphoric Clarity, Balanced Physical Relaxation, Sociable Uplift |
Environment |
Indoor Or Outdoor |
About Black Jack
Black Jack combines resinous indica structure with Jack Herer brightness to produce dense, aromatic buds. It suits growers in controlled indoor spaces and can perform outdoors in a sheltered UK summer when attention is paid to humidity and airflow.
Grow Difficulty:
Growing Black Jack under variable British weather requires attention to humidity and airflow and rates as a moderate challenge for home growers. Climatic swings in the UK demand watchful feeding and pest control, especially where variable British weather brings damp periods.
Flowering Time:
Flowering completes in approximately eight to nine weeks under controlled light schedules. Outdoor growers can expect harvest readiness in late season if conditions remain favourable.
Yield:
Indoor yields are moderate to high when trained and fed correctly, typically in the 400–550 g/m² range. Outdoor performance depends on summer length and ventilation, so results vary year to year.
Height:
Plants show a compact to medium stature with sturdy branches that support dense buds. They can stretch during early flowering but remain manageable with simple topping and low-stress training.
Environment:
Indoors this strain responds very well to controlled environments and performs under LED rigs with good canopy management in Oxfordshire. Outdoors in Oxfordshire it benefits from a sunny, sheltered site but needs protection if autumn brings prolonged rain.
Climate:
Growing Black Jack in Oxfordshire means planning for changeable conditions and occasional cool, damp spells due to the variable British weather. Good drainage, airflow and quick disease checks are essential to protect outdoor crops in that region.
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
£8.00 / seed • You save £13.33
100% Satisfaction Guarantee • Secured Payments