
Jack the Ripper Feminised
Jack the Ripper Feminised — premium sativa cannabis seeds suited to Irish growing conditions. 18% THC with creative, energetic, happy effects. Discreet delivery across Ireland, with sourced grow figures on every strain page.
Royal King Genetics — 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 2026-09-11 on 150 seeds at 20-23°C.
About Jack the Ripper Feminised
Does Jack the Ripper finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. At 25/75 it will want height, and height outdoors here means wind. Stake it earlier than you think you need to. Bloom takes 8-9 weeks, 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 200g/m² indoors and Up to 400 gr 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 18% 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 the Ripper
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 — fish, blood and bone, seaweed meal, rock phosphate — if you are not, and want flavour. Both suit this sativa; the deciding factor is your week, not the plant.
How does it handle the weather here? The open structure sheds heat and, more usefully, dries out quickly after rain. Wind is the real problem for a plant this shape — stake it properly before it needs it.
When does bloom feed start? Within a week of the first pistils. The 25/75 balance shifts demand quickly at the transition — 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 8-9 weeks of bloom completely; outdoors the plant gets light no lamp matches and can reach Up to 400 gr, and pays for it in rain. Flowering: 8-9 weeks. Indoor yield: Up to 200g/m². Outdoor yield: Up to 400 gr. Plant height: Medium. Rated medium difficulty.
What Jack the Ripper is like in practice
The catalogue lists creative, energetic, happy, and that matches what growers here report back. At 18% THC this sativa sits where there is a usable window rather than a cliff. At 175-185°C the first effect is lift and mental energy, which suits company, a long walk, or work that benefits from it. The body stays light, so it is a genuine daytime option for anyone with a tolerance. The Terpinolene and Limonene together leave a finish that keeps shifting across a session.
Suited to company, creative work, and getting out of the house.
Terpene breakdown
Primary: Terpinolene · Secondary: Limonene · Tertiary: Ocimene. This is a combination that turns up repeatedly in cultivars people rate, and it is usually what gets commented on when a jar is opened for the first time after a proper cure. Terpinolene anchors it, limonene holds the middle, and ocimene sits behind both — the last of those being what separates this from other strains leading on the same terpene.
Who it suits
Jack the Ripper 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. Photoperiod genetics leave plant size and harvest date under your control — veg longer for a bigger plant, or flip early when the ceiling is low. A bloom of 8-9 weeks fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.
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Jack the Ripper 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.
Five generations of inbred selection on the original 1990s landrace-derived Jack the Ripper cuts. We were not chasing a redesign — we locked the finished-flower potency that earned this cultivar its reputation. Whatever the next pack throws is what the last pack threw.
Pin down the original 1990s landrace-derived terpene profile in modern seed form.
Chosen for terpene saturation, sativa vigour and a workable finish time despite long-flowering genetics.
Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.