RK
Cali Jack cannabis seeds packaging β€” Royal King Seeds UK
Hybrid
THC 24%
🎨 Creative
HybridFeminisedIn Stock

Cali Jack Feminised

Feminised PhotoperiodSee Lab Report β†’

Grow Cali Jack Feminised in the UK. Hybrid genetics at 24% THC, known for euphoric, creative, calm effects.

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Β£12.13
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Royal King Genetics β€” first-party test batch

Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-05 on 375 seeds.

Germination rate: 96.9% (n=375)
Last QC test date: 2026-09-05
Indoor yield: 456-602 g/mΒ² (avg across 8 verified grower reports)
Outdoor yield: 622-934 g/plant (avg across 7 verified grower reports)

About Cali Jack Feminised

Will Cali Jack finish outdoors in Britain? Yes, within the April to October season. The balanced genetics cope with what British weather does from one week to the next, from damp air on the west coast to the drier run of counties in the east. Flowering runs 9-11 weeks, which puts harvest in September or October for most of the country.

What yield is realistic? 400-600 g/m2 indoors is achievable with competent LED lighting and attention to feeding. Outdoors, 550 g/plant is realistic in 50 litre pots or in prepared ground with full sun β€” and "full sun" is doing a lot of work in that sentence at these latitudes, so the position you pick in the garden matters more than the pot you buy. At 24% THC with a limonene-forward profile, the return on the effort is sound.

Is it forgiving? Reasonably. Anyone comfortable with pH, a feed schedule and a light timer will get a good result. It will not hold your hand, but it will not punish one missed watering either.

Further questions we get asked about Cali Jack

Which medium? For flavour, peat-free soil cut with about 30% perlite and amended slowly β€” fish, blood and bone, rock phosphate, seaweed meal, all of it available at any British garden centre. For weight, coco with fertigation at EC 1.4-1.8 through bloom. This hybrid performs in both; the choice is about what you want out of it.

How does it handle a British summer? Well enough, on hybrid vigour. Keep the root zone under 28Β°C with mulch or pale pots, and do not transplant into a heatwave. The more common British problem is the opposite one: a cold, wet July that never lets the plant dry out between waterings.

When do I switch to bloom feed? Inside the first week of visible pistils. The 36/64 balance shifts its demand quickly at the transition β€” phosphorus and potassium up, nitrogen down. Soil growers can top-dress with guano and sulphate of potash; coco and hydro should move to a low-nitrogen bloom formula straight away.

Indoors or outdoors? Both work, for different reasons. Indoors you own the flowering environment completely. Outdoors, across the April to October season, the plant gets a light intensity no domestic LED matches and can reach 550 g/plant β€” at the price of accepting whatever the autumn does. Flowering: 9-11 weeks. Indoor yield: 400-600 g/m2. Outdoor yield: 550 g/plant. Rated intermediate difficulty.

Flavour, aroma and effect

Cali Jack arrives in stages. The first draw at 24% THC brings a bright citrus edge that lifts off the palate immediately. The euphoric, creative, calm character follows within minutes, as a head and body effect at once. The mind stays clear while the muscles let go by degrees, which is what makes it adaptable β€” a small dose carries an afternoon, a larger one turns into an evening. The caryophyllene underneath adds a warmth that keeps the whole thing anchored.

Terpene breakdown

Primary: Limonene Β· Secondary: Caryophyllene Β· Tertiary: Linalool. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188Β°C, keeps the caryophyllene and linalool audible over the limonene base. Run it hotter, or burn it, and the three collapse into one note β€” pleasant enough, but none of the complexity that made it worth choosing.

Who it suits

Who does well with Cali Jack? Indoor growers who want the timeline under their own control. Outdoor growers who want to choose when flowering starts. Anyone with the room and the patience to veg it properly before flipping. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.

Effects

πŸ€—Euphoric
74% of people reported feeling Euphoric
🀩Creative
70% of people reported feeling Creative
🧘Calm
60% of people reported feeling Calm
😌Relaxed
51% of people reported feeling Relaxed
😊Happy
45% of people reported feeling Happy
😎Uplifted
38% of people reported feeling Uplifted
🀀Hungry
34% of people reported feeling Hungry
😴Sleepy
31% of people reported feeling Sleepy
πŸ˜†Giggly
24% of people reported feeling Giggly

Strain Type

Indica 36%Sativa 64%

Strain Data Sheet

🧬THC24% - 28% (High)
🌿LineageBalanced Hybrid (Undisclosed Lineage)
πŸ”¬TypeFeminised Hybrid
🌑ClimateTemperate, adaptable
πŸ“…HarvestLate Sept – Oct, UK outdoor (typical)
πŸ“Height100 – 160 cm (typical)
βš–οΈYieldHigh
🏠Yield Indoor400-600 g/m2
🌳Yield Outdoor550 g/plant
⏱Flowering Time9-11 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised 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 United Kingdom legislation.
1
Cali Jack Feminised
royalkingseeds.co.uk
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πŸ”’Sealed for authenticity
πŸ’§Waterproof coating
πŸ›‘οΈAluminium interior lining
🏷️Protective sticker
πŸ“±QR code verification
πŸ”’Scratchable serial number

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Cali Jack Feminised β€” Breeder Information

Royal King Genetics

Bred and stabilised in-house by Royal King Genetics β€” 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
F4
Generations
4+
Breeding Programme
F4 Production Line β€” modern cross stabilisation
Stabilisation Notes β€” What This Means for Your Grow

A mid-2010s cross stabilised over four generations of selection. Cali Jack grows true-to-type with the bud density that defines the cultivar.

Breeding Goal

Cull off-type phenos in Cali Jack through filial selection.

Selection Focus

Chosen for vigour, terpene saturation and a tight finish window that allows production planning.

Pollen / Mother Source

Royal King Genetics elite-cut archive β€” pollen from a maintained S1 line of the original elite mother.

Last Batch QC Verified
12 September 2026Β· 99%+ germination