Jack the Ripper cannabis seeds packaging — Royal King Seeds the UK
Sativa
THC 18%
🎨 Creative
SativaFeminizedIn Stock

Jack the Ripper Feminized

Feminized PhotoperiodSee Lab Report →

Jack the Ripper Feminized — sativa cannabis seeds suited to UK growing conditions. 18% THC with creative, energetic, happy effects. Fast, discreet UK delivery.

Select Pack Size
£12.20
1
🇬🇧Free AU Delivery
🌱Germination Promise
🔒Unmarked Packaging

About Jack the Ripper Feminized

Can I grow Jack the Ripper outdoors in the UK? Absolutely. This 25/75 sativa is well-suited to the UK outdoor season running April through October. Expect taller plants that appreciate the long summer daylight hours — give it room to stretch and you will be rewarded with impressive cola development. Flowering takes 8-9 weeks, placing your harvest window squarely in September or October for most UK latitudes.

What kind of yield should I realistically expect? We do not publish a per-strain yield figure for this cultivar, so treat any number you see elsewhere with caution. Yield depends far more on your lighting, pot size, feeding and training than on genetics alone. At 18% THC and a terpinolene-forward terpene profile, the quality-to-effort ratio makes Jack the Ripper genuinely worthwhile.

Is this strain forgiving for newer growers? Reasonably so. A grower with basic knowledge of pH, feeding schedules, and light cycles will manage fine. It is not the most forgiving plant if you neglect it entirely, but it will not collapse at the first missed watering either.

More Questions UK Growers Ask About Jack the Ripper

What growing medium works best for this strain? For maximum flavour complexity, organic soil blended with 30% perlite and enriched with slow-release amendments (blood, fish and bone, rock phosphate, kelp meal — all readily available at a garden centre or your local hydroponics shop). For maximum yield, coco coir with automated fertigation at EC 1.4-1.8 during bloom. Both approaches produce excellent results with this sativa genetics.

How does it handle British summer heat? Better than most. The open canopy structure allows heat to dissipate naturally. In a rare UK heatwave (32°C+), midday wilting may occur but recovery is swift once temperatures drop. Shade netting at 30% reduces intensity without significantly impacting growth.

When should I start feeding bloom nutrients? Within the first week of visible pistil formation. This cultivar's 25/75 genetics shifts its nutritional demand rapidly at the transition. Phosphorus and potassium uptake increases noticeably, whilst nitrogen demand drops. An organic top-dress of bat guano and sulphate of potash works well for soil growers; hydro and coco growers should switch to a bloom-ratio formula (low N, high PK) immediately.

Indoor or outdoor — which is better for this strain? Both work. Indoor gives you control over the 8-9 weeks environment. Outdoor in the UK growing season (April-October) lets the plant reach its full potential with natural sunlight intensity that even expensive LEDs struggle to match. Flowering: 8-9 weeks. Rated intermediate difficulty.

What to Expect When Using Jack the Ripper

UK customers report creative, energetic, happy as the defining characteristics, and our experience aligns with that consensus. At 18% THC, this sativa sits in a potency bracket where most users find a productive sweet spot. Vaporised at 175-185°C, the initial effect is a noticeable uplift in mood and mental energy that pairs well with creative projects, long walks, or an afternoon with friends. The body remains light and mobile throughout, making this a genuine daytime option for those with THC tolerance. The Terpinolene/Limonene terpene combination imparts a flavour that lingers on the palate — complex and shifting, revealing new notes across the session.

Ideal settings: creative pursuits, social gatherings, outdoor adventures, and daytime leisure.

Terpene Breakdown

Primary: Terpinolene · Secondary: Limonene · Tertiary: Ocimene. This particular terpene trio appears frequently in award-winning cultivars and produces a nose that most UK growers find immediately appealing when jars are first opened after curing. The terpinolene dominance anchors the aroma, limonene provides mid-range character, and ocimene contributes a subtle background note that distinguishes this strain from others sharing the same primary terpene.

Suitability and Recommendations

Jack the Ripper suits growers with fundamental skills already established. You should understand pH management, basic nutrient ratios, and light cycle requirements before committing to this cultivar — it will not hold your hand, but it will not punish minor mistakes harshly either. Photoperiod genetics give you complete control over plant size and harvest timing — extend the vegetative phase for larger plants or flip early for a quicker turnaround in compact spaces. The UK growing season (April through October) accommodates the 8-9 weeks bloom period comfortably for outdoor cultivators across the country. Shipped discreetly across the UK with our germination guarantee.

Effects

🤩Creative
77% of people reported feeling Creative
🤑Energetic
64% of people reported feeling Energetic
😊Happy
58% of people reported feeling Happy
😎Uplifted
51% of people reported feeling Uplifted
🤗Euphoric
47% of people reported feeling Euphoric
🧠Focused
42% of people reported feeling Focused
🗣️Talkative
30% of people reported feeling Talkative
💪Motivated
31% of people reported feeling Motivated
😆Giggly
24% of people reported feeling Giggly

Strain Type

Indica 25%Sativa 75%

Strain Data Sheet

🧬THC18% - 21% (Medium-High)
🌿LineageJack's Cleaner × Space Dude
🔬TypeFeminized Sativa
🌡ClimateWarm / Mediterranean, long season
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height120 – 200 cm (typical)
⚖️YieldMedium – High
🏠Yield Indoor400 – 500 g/m² (typical)
🌳Yield Outdoor400 – 600 g/plant (typical)
Flowering Time8-9 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminized Premium
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers must comply with all applicable UK Commonwealth, state, and territory legislation.
1
Jack the Ripper Feminized
royalkingseeds.co.uk
IG
FB
X
🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

Related Strains

Strawberry Milkshake cannabis seeds packaging — Royal King Seeds the UK
Hybrid
THC 19%
📈 High Yield

Strawberry Milkshake Feminized

RelaxedHappyEuphoric
£9.76
Fruity Pebbles cannabis seeds packaging — Royal King Seeds the UK
Hybrid
THC 20%
🎨 Creative

Fruity Pebbles Feminized

UpliftedHappyRelaxed
£11.38
Jane Doe cannabis seeds packaging — Royal King Seeds the UK
Hybrid
THC 23%
🌙 Sleep Aid

Jane Doe Feminized

RelaxedEuphoricCalm
£10.98
Gorilla Cookies cannabis seeds packaging — Royal King Seeds the UK
Indica
THC 24%
🎨 Creative

Gorilla Cookies Feminized

EuphoricCreativeCalm
£11.79

Jack the Ripper Feminized — Breeder Information

Royal King Genetics

Bred 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.

Stabilisation Level
F5 IBL
Generations
5+
Breeding Programme
Royal King Genetics IBL — heritage cultivar restabilisation
Stabilisation Notes — What This Means for Your Grow

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.

Breeding Goal

Pin down the original 1990s landrace-derived terpene profile in modern seed form.

Selection Focus

Chosen for terpene saturation, sativa vigour and a workable finish time despite long-flowering genetics.

Pollen / Mother Source

Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.

Last Batch QC Verified
22 March 2026· 99%+ germination