RK
Jack Flash cannabis seeds packaging โ€” Royal King Seeds Ireland
HybridAuto
THC 19%
๐Ÿ˜Š Beginner Pick
HybridAutoflowerIn Stock

Jack Flash Auto

Order Jack Flash Auto seeds online in Ireland. A quality hybrid cultivar at 19% THC delivering creative, energetic, relaxed. Chosen for a short season and a damp finish. Fast shipping and a germination guarantee.

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โ‚ฌ13.23EUR
1
๐Ÿ‡ฎ๐Ÿ‡ชFree Irish Delivery
๐ŸŒฑGermination Promise
๐Ÿ”’Unmarked Packaging
โš—

Royal King Genetics โ€” first-party test batch

Figures below are from our internal seed-lot QC and verified Irish grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-09 on 350 seeds at 20-23ยฐC.

Germination rate: 96.4% (n=350)
Last QC test date: 2026-09-09
Indoor yield: 410-574 g/mยฒ (avg across 10 verified grower reports)
Outdoor yield, Ireland: 508-670 g/plant (avg across 9 verified grower reports)

About Jack Flash Auto

Does Jack Flash finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. The 60/40 balance handles an Irish season without special treatment, which is most of the reason to choose it. Bloom takes 60-70 days, so the harvest date is set by the calendar far more than by your technique.

What should I expect to take off it? up to 450 g/m2 indoors and up to 600 g/plant outdoors are the published figures, and both assume a full light or a full season plus a root run to match. A tunnel gets you most of the way to the outdoor number; a windowsill will not. At 19% THC the effort is well spent either way.

Is it a sensible first grow? Reasonably. Anyone who has finished one grow will manage this one; it asks for consistency rather than expertise.

Other questions that come up about Jack Flash

Soil or coco? Coco with fertigation at EC 1.4-1.8 through bloom if you are there daily and want speed. Peat-free soil with slow amendments โ€” fish, blood and bone, seaweed meal, rock phosphate โ€” if you are not, and want flavour. Both suit this hybrid; the deciding factor is your week, not the plant.

How does it handle the weather here? Hybrid vigour covers most of what an Irish summer does. Keep the root zone under 28ยฐC and do not transplant into a warm spell.

When does bloom feed start? Within a week of the first pistils. The 60/40 balance shifts demand quickly at the transition โ€” phosphorus and potassium up, nitrogen down. Soil growers top-dress; coco and hydro switch formula immediately.

Tunnel, outdoors or indoors? A tunnel is the best value of the three here. Indoors you own the 60-70 days of bloom completely; outdoors the plant gets light no lamp matches and can reach up to 600 g/plant, and pays for it in rain. Flowering: 60-70 days. Indoor yield: up to 450 g/m2. Outdoor yield: up to 600 g/plant. Plant height: Short. Rated master difficulty.

What Jack Flash is like in practice

The catalogue lists creative, energetic, relaxed, and that matches what growers here report back. At 19% THC this hybrid sits where the balance is the argument for it. Small doses stay functional, larger ones relax properly, and the 60/40 split means the direction is set by the amount rather than fixed by the plant. The Caryophyllene and Myrcene together leave warmth and spice, drying on the exhale.

Suited to most occasions, with the dose doing the steering.

Terpene breakdown

Primary: Caryophyllene ยท Secondary: Myrcene ยท Tertiary: Humulene. Temperature decides how much of this profile survives. Low vaporisation at 180-188ยฐC keeps myrcene and humulene audible over the caryophyllene; run it hotter, or burn it, and all three collapse into one note that is pleasant enough and tells you nothing.

Who it suits

Jack Flash suits growers with the fundamentals in place. Understand pH, rough nutrient ratios and a light cycle before committing to it; it asks for competence rather than expertise. Autoflowering genetics remove the light schedule from the equation, which matters in a shed or a spare room where full darkness is not realistic. A bloom of 60-70 days fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.

Effects

๐ŸคฉCreative
77% of people reported feeling Creative
๐Ÿค‘Energetic
64% of people reported feeling Energetic
๐Ÿ˜ŒRelaxed
58% of people reported feeling Relaxed
๐Ÿ˜ŠHappy
51% of people reported feeling Happy
๐Ÿค—Euphoric
47% of people reported feeling Euphoric
๐Ÿ˜ŽUplifted
38% of people reported feeling Uplifted
๐ŸคคHungry
34% of people reported feeling Hungry
๐Ÿ˜ดSleepy
31% of people reported feeling Sleepy
๐Ÿ˜†Giggly
24% of people reported feeling Giggly

Best For

โœฆ Daytime
โœฆ Depression
โœฆ Pain
โœฆ Stress

Strain Type

Indica 60%Sativa 40%

Strain Data Sheet

๐ŸงฌTHC19% - 24% (Medium-High)
๐ŸŒฟLineageJack Herer ร— Super Skunk ร— Haze
๐Ÿ”ฌTypeAutoflower Hybrid
๐ŸŒกClimateAll climates (adaptable)
๐Ÿ“…Harvestโ‰ˆ 10 โ€“ 11 weeks from seed (typical)
๐Ÿ“HeightShort
โš–๏ธYieldMedium โ€“ High
๐Ÿ Yield Indoorup to 450 g/m2
๐ŸŒณYield Outdoorup to 600 g/plant
โฑFlowering Time60-70 days

Packaging

Resealable +
RK
Royal King Seeds
Autoflowering
Regular
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers are responsible for complying with the law where they live.
1
Jack Flash Auto
royalkingseeds.ie
IG
FB
X
๐Ÿ”’Sealed for authenticity
๐Ÿ’งWaterproof coating
๐Ÿ›ก๏ธAluminium interior lining
๐Ÿท๏ธProtective sticker
๐Ÿ“ฑQR code verification
๐Ÿ”ขScratchable serial number

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Jack Flash Auto โ€” Breeder Information

Royal King Genetics

Bred and stabilised in-house by Royal King Genetics โ€” 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.

Stabilisation Level
F5
Generations
5+
Breeding Programme
Autoflower Stabilisation (F5) โ€” ruderalis trait fixing
Stabilisation Notes โ€” What This Means for Your Grow

Five generations of Royal King Genetics autoflower stabilisation on Jack Flash. Auto trigger time, finish window and pack-to-pack uniformity all run uniform โ€” no photo-hybrid surprises in the pack.

Breeding Goal

Reach auto trigger and finish-window uniformity for the Jack Flash pack.

Selection Focus

Chosen for hybrid frame, clean terpene expression and consistent yield across the population.

Pollen / Mother Source

Royal King Genetics in-house breeder room โ€” pollen taken from a generation-tracked sibling-male line.

Last Batch QC Verified
18 September 2026ยท 99%+ germination