Jack Flash Auto
Buy Jack Flash Auto seeds in South Africa. Hybrid · 19% THC · creative, energetic, relaxed. Every figure on this page is sourced, and every order ships unbranded.
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 2026-09-06 on 200 seeds.
About Jack Flash Auto
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 60-70 days, placing harvest between March and May across most provinces.
What yield is realistic? up to 450 g/m2 indoors is reachable under decent LED with steady feeding. Outdoors, up to 600 g/plant a plant is normal in 50 litre pots or straight into prepared ground in full sun. At 19% THC with caryophyllene 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 Caryophyllene, then Myrcene, and Humulene underneath.
Difficulty: master. In flower for 60-70 days. Stands Short. Indoors it returns up to 450 g/m2. Outdoors, up to 600 g/plant a plant.
Effects
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In the Packet
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Jack Flash Auto — 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 Royal King Genetics autoflower stabilisation on Jack Flash. Auto trigger time, finish window and pack-to-pack uniformity all run uniform — no photo-hybrid surprises in the pack.
Reach auto trigger and finish-window uniformity for the Jack Flash pack.
Chosen for hybrid frame, clean terpene expression and consistent yield across the population.
Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.