
Super Jack Feminised
Super Jack Feminised cannabis seeds for UK growers. Hybrid · 26% THC · creative, focused, energetic. Discreet UK delivery, priced in GBP.
Royal King Genetics — first-party test batch
Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-14 on 400 seeds.
About Super Jack Feminised
Germination and early veg, days 1-14. Super Jack seeds generally crack inside 48 hours on damp kitchen roll and break the surface around day three. Early growth came in even and unhurried, neither racing nor sulking. Four solid nodes by day 14 with the spacing that hints at the hybrid frame to come. Damping off is rare around 70% relative humidity, which is also roughly what an unheated British room sits at in spring.
Veg, weeks 3-6. It took a simple top-and-tie approach well. Topping at node four gave six strong leaders, tied down gently, and an even canopy across a 70cm square by the flip.
Bloom, weeks 1-9. This is where the 60/40 balance in Super Jack showed itself. The limonene came up in week three and kept building; trichome cover was obvious to the naked eye from week five. Indoor yield: up to 450 g/m2. THC testing at 26%. Rated intermediate.
The rest of the diary
Mid-bloom, weeks 4-6. The change came quickly. Sites that were loose and wispy at week three closed into defined colas. Development stayed even across the whole canopy, which is what the veg training bought — eight comparable colas instead of one dominant top and a handful of also-rans. Resin was visible to the naked eye from week four.
Ripening, weeks 7-9. Feeding dropped to plain water for the last ten days. The limonene got strong enough that carbon filtration stopped being optional in a terraced house. Trichomes ran clear to milky across the final fortnight, amber showing on sugar leaves first. Around 15% amber on the calyxes is a common place to stop.
Drying and curing. Whole plant hung in the dark at 17°C and 58% humidity for twelve days — both numbers held by a dehumidifier, because an October room in this country will not hold either on its own. Stems snapped rather than bent, which is the test worth trusting. Four weeks in glass followed, burped twice daily for the first fortnight and once daily after. Final weight matched the up to 450 g/m2 figure. The caryophyllene was far more present after the cure than at harvest, which is the argument for curing properly: the process makes flavour rather than merely keeping it.
Flowering: 55-65 days. Indoor yield: up to 450 g/m2. Outdoor yield: up to 550 g/plant. Rated intermediate difficulty. Feminised seeds.
Flavour, aroma and effect
Super Jack arrives in stages. The first draw at 26% THC brings a bright citrus edge that lifts off the palate immediately. The creative, focused, energetic character follows within minutes, as a head and body effect at once. The mind stays clear while the muscles let go by degrees, which is what makes it adaptable — a small dose carries an afternoon, a larger one turns into an evening. The caryophyllene underneath adds a warmth that keeps the whole thing anchored.
Terpene breakdown
Primary: Limonene · Secondary: Caryophyllene · Tertiary: Linalool. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188°C, keeps the caryophyllene and linalool audible over the limonene base. Run it hotter, or burn it, and the three collapse into one note — pleasant enough, but none of the complexity that made it worth choosing.
Who it suits
Who does well with Super Jack? Indoor growers who want the timeline under their own control. Outdoor growers who want to choose when flowering starts. Anyone with the room and the patience to veg it properly before flipping. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.
Effects
Strain Type
Strain Data Sheet
Packaging
Feminised Premium
Seeds
authenticity
lining
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Super Jack Feminised — Breeder Information
Royal King GeneticsBred and stabilised in-house by Royal King Genetics — our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read the full breeding process and about page.
F3 stabilisation on the Super Jack cross. Three rounds of selection have brought the population to roughly 80% trait homogeneity — a small fraction of pheno variance is still present and is being culled in the next cycle.
Stabilise Super Jack across three rounds toward F4 production-ready stock.
Chosen for terpene profile, vigour, structure and finish-time consistency.
Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.