Jack Herer cannabis seeds packaging — Royal King Seeds UK
Hybrid
THC 18%
🔥 46 sold this week
HybridFeminisedIn Stock

Jack Herer Feminised

Feminised PhotoperiodSee Lab Report →

Jack Herer Feminised seeds. A hybrid cultivar at 18% THC delivering focused, energetic. Grow figures from named sources.

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Royal King Genetics — 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 2026-09-24 on 175 seeds.

Germination rate: 99.0% (n=175)
Last QC test date: 2026-09-24
Indoor yield: 441-580 g/m² (avg across 13 verified grower reports)
Outdoor yield: 531-868 g/plant (avg across 8 verified grower reports)

About Jack Herer Feminised

Read Jack Herer backwards from the harvest: 500-600g/m² under lights, 120 - 200 g/plant outdoors, with resin filling out towards 18% THC. Weight goes on evenly across the 10 to 12 weeks of bloom, with a clear surge in the last two weeks that rewards leaving the plant alone. The 45/55 split gives you calyx density and an even spread of resin rather than one at the cost of the other. Outdoors, late September to mid-October is the window that misses the wettest of the finish across most of the country while still letting the myrcene arrive.

Getting the weight out of this plant

Three stretches of the 10 to 12 weeks of bloom decide whether you reach the top of this strain's range (500-600g/m² indoors, 120 - 200 g/plant outdoors). The rest is maintenance.

The first ten days of flower. What the plant does during the stretch sets canopy height, and canopy height sets how evenly the light lands. Somewhere around a third is typical. One pass of low-stress training over the tallest shoots keeps the top flat.

Weeks three to five. Myrcene production climbs through here, and it responds to a day-night temperature gap of 6-8°C. British autumn nights hand that to outdoor growers for free from September; indoors you have to build it, at roughly 25-26°C lights-on and 18-20°C lights-off. Bloom feed goes potassium-heavy around EC 1.6-1.8.

The last ten to fourteen days. Stop feeding and run pH-corrected water. Check trichomes daily under a 60x loupe — cut at 10-15% amber for the middle of the range. Outdoors that lands between late September and mid-October across most of Britain, and the weather forecast should get a vote.

Flowering: 10 to 12 weeks. Indoor yield: 500-600g/m². Outdoor yield: 120 - 200 g/plant. Rated intermediate difficulty.

What Jack Herer is actually like

Growers report focused, energetic as the defining characteristics and our own notes agree. At 18% THC this hybrid sits where the balance is the selling point. Taken small it stays functional; taken larger it relaxes properly. The ${indica}/${sativa} split means the direction is set by how much you take rather than fixed by the genetics. The Myrcene/Limonene pairing leaves earth and faint sweetness on the palate, with fruit at the end.

Best suited to most occasions — the dose does the steering.

Terpene breakdown

Primary: Myrcene · Secondary: Limonene · Tertiary: Pinene. These three build an aroma that keeps moving through the cure. Fresh off the dry it leads with myrcene; after three or four weeks sealed in glass at 16-18°C the pinene underneath comes up and the whole thing gains a layer. Vaporising between 180°C and 195°C catches the widest span of them, since the lighter pinene molecules are the first thing heat destroys.

Who it suits

Jack Herer suits growers with the basics in place. Understand pH, rough nutrient ratios and light cycles before you commit to it; it asks for competence rather than expertise. Photoperiod genetics leave plant size and harvest date under your control — veg longer for bigger plants, or flip early when space is short. The April to October season accommodates a bloom of 10 to 12 weeks comfortably for outdoor growers across the country.

Effects

🧠Focused
76% of people reported feeling Focused
🤑Energetic
64% of people reported feeling Energetic
😌Relaxed
58% of people reported feeling Relaxed
😊Happy
51% of people reported feeling Happy
🤩Creative
50% of people reported feeling Creative
🤗Euphoric
40% of people reported feeling Euphoric
😎Uplifted
31% of people reported feeling Uplifted
🤤Hungry
27% of people reported feeling Hungry
😴Sleepy
24% of people reported feeling Sleepy

Strain Type

Indica 45%Sativa 55%

Strain Data Sheet

🧬THC18% - 23% (Medium-High)
🌿LineageHaze × Northern Lights #5 × Shiva Skunk
🔬TypeFeminised Hybrid
🌡ClimateTemperate, adaptable
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height100 – 160 cm (typical)
⚖️YieldHigh
🏠Yield Indoor500-600g/m²
🌳Yield Outdoor120 - 200 g/plant
⏱Flowering Time10 to 12 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.
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Jack Herer Feminised
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💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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Jack Herer Feminised — 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
Inbred Line (IBL) — multi-generation inbred selection
Stabilisation Notes — What This Means for Your Grow

A heritage cultivar that we have taken through five rounds of inbred selection. The late-1990s legacy reference profile — terpene fingerprint, finishing window, plant frame — has been welded into the population. Every seed in the pack carries the trait set that put Jack Herer on the map.

Breeding Goal

Bring the original Jack Herer reference profile back to true-to-type seed stock.

Selection Focus

Chosen for balanced indica/sativa expression, terpene fidelity and pack-to-pack uniformity.

Pollen / Mother Source

Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.

Last Batch QC Verified
21 September 2026· 99%+ germination