Jack Flash Feminised
Jack Flash Feminised for South African growers — hybrid genetics at 19% THC, reported as creative, energetic, relaxed. Sourced grow figures on the page, plain packaging, delivered nationwide.
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 2026-09-18 on 450 seeds.
About Jack Flash Feminised
Will Jack Flash handle a South African summer outdoors? Yes. Put this 60/40 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 55 to 75 days, placing harvest between March and May across most provinces.
What yield is realistic? 450 gr/m² indoors is reachable under decent LED with steady feeding. Outdoors, around 600 g/plant a plant is normal in 50 litre pots or straight into prepared ground in full sun. At 19% THC with myrcene 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 Myrcene, then Limonene, and Pinene underneath.
Difficulty: medium. In flower for 55 to 75 days. Stands up to 180 cm (indica pheno ~100 cm). Indoors it returns 450 gr/m². Outdoors, around 600 g/plant a plant.
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Jack Flash 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.
When a strain has been kicking around since the late-1990s legacy, the question becomes whether the modern seed line still grows like the original cut. Our F5 IBL on Jack Flash answers that — five rounds of selection have re-locked the structural balance that made the cultivar a benchmark.
Restabilise a late-1990s legacy cultivar to contemporary uniformity standards.
Chosen for balanced indica/sativa expression, terpene fidelity and pack-to-pack uniformity.
Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.