Critical Jack Feminised
Critical Jack Feminised: hybrid cannabis seeds picked for South African conditions. 20% THC, with focused, relaxed, uplifted the effects most often reported. Posted discreetly countrywide.
Royal King Genetics — Seed-Lot Testing
Figures below come from our own seed-lot testing rather than breeder marketing, taken from a single batch tested 2026-09-15 on 350 seeds.
About Critical Jack Feminised
Will Critical Jack handle a South African summer outdoors? Yes. Put this 50/50 hybrid in the ground between September and November and you will be cutting from March to May. The balanced genetics take what the country gives them, from coastal humidity in KwaZulu-Natal through to dry Karoo heat. Bloom runs 60 days, placing harvest between March and May across most provinces.
What yield is realistic? 625 g/m2 indoors is reachable under decent LED with steady feeding. Outdoors, 1200 g/plant a plant is normal in 50 litre pots or straight into prepared ground in full sun. At 20% THC with limonene in front, the return on effort is good.
How much can go wrong before it shows? Some. Anyone who understands pH, a feeding schedule and a light cycle will be fine. Neglect it entirely and it will suffer, but a single missed watering will not undo the grow.
The Aromatic Three
Leading with Limonene, then Caryophyllene, and Linalool underneath.
Difficulty: medium. In flower for 60 days. Stands Medium. Indoors it returns 625 g/m2. Outdoors, 1200 g/plant a plant.
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Critical Jack Feminised — Breeder Information
Royal King GeneticsRecreated and stabilised by Royal King Genetics, the breeding team behind this catalogue. Seed lots are germination-tested before they ship. More on the breeding process and about page.
Five generations of inbred selection on the original early-2000s legacy Critical Jack cuts. We were not chasing a redesign — we locked the pack-to-pack uniformity that earned this cultivar its reputation. Whatever the next pack throws is what the last pack threw.
Restabilise a early-2000s legacy cultivar to contemporary uniformity standards.
Chosen for terpene profile, vigour, structure and finish-time consistency.
Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.