Painkiller XL cannabis seeds packaging — Royal King Seeds UK
Sativa
THC 9%
🌙 Sleep Aid
SativaFeminisedIn Stock

Painkiller XL Feminised

Feminised PhotoperiodSee Lab Report →

Painkiller XL Feminised seeds. A sativa cultivar at 9% THC delivering euphoric, relaxed, sleepy. 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 2026-09-05 on 450 seeds.

Germination rate: 96.1% (n=450)
Last QC test date: 2026-09-05
Indoor yield: 399-516 g/m² (avg across 11 verified grower reports)
Outdoor yield: 545-824 g/plant (avg across 6 verified grower reports)

About Painkiller XL Feminised

Germination and early veg, days 1-14. Painkiller XL seeds generally crack inside 48 hours on damp kitchen roll and break the surface around day three. Early growth came in fast and upright, the first narrow leaves reaching for the light from the start. Five nodes by the end of week two with obvious space between them, which tells you what the stretch is going to do later. Damping off is rare around 70% relative humidity, which is also roughly what an unheated British room sits at in spring.

Veg, weeks 3-6. Vertical growth needed managing. Even with low-stress training from week three it wanted to climb, so the main stem went over at a right angle in week four; the secondaries caught up and the canopy was flat by week six.

Bloom, weeks 1-9. This is where the 25/75 balance in Painkiller XL showed itself. The limonene came up in week three and kept building; trichome cover was obvious to the naked eye from week five. Indoor yield: 500-550 g/m2. Height: 60-100 cm. THC testing at 9%. Rated intermediate.

The rest of the diary

Mid-bloom, weeks 4-6. The change came quickly. Sites that were loose and wispy at week three closed into defined colas. The buds kept extending lengthwise, stacking fresh calyxes along the stems. The secondaries outperformed expectations: the open structure let light reach sites that a bushier plant would have shaded out completely.

Ripening, weeks 7-9. Feeding dropped to plain water for the last ten days. The limonene got strong enough that carbon filtration stopped being optional in a terraced house. Trichomes ran clear to milky across the final fortnight, amber showing on sugar leaves first. Around 15% amber on the calyxes is a common place to stop.

Drying and curing. Whole plant hung in the dark at 17°C and 58% humidity for twelve days — both numbers held by a dehumidifier, because an October room in this country will not hold either on its own. Stems snapped rather than bent, which is the test worth trusting. Four weeks in glass followed, burped twice daily for the first fortnight and once daily after. Final weight matched the 500-550 g/m2 figure. The terpinolene was far more present after the cure than at harvest, which is the argument for curing properly: the process makes flavour rather than merely keeping it.

Flowering: 50-60 days. Indoor yield: 500-550 g/m2. Outdoor yield: 500-550 g/plant. Plant height: 60-100 cm. Rated intermediate difficulty. Feminised seeds.

What Painkiller XL is actually like

Growers report euphoric, relaxed, sleepy as the defining characteristics and our own notes agree. At 9% THC this sativa sits where most people find a workable window. Vaporised at 175-185°C the first effect is lift and mental energy, suited to work that benefits from it, a long walk, or an afternoon with company. The body stays light throughout, which makes it a genuine daytime option for anyone with a tolerance. The Limonene/Terpinolene pairing leaves a clean citrus finish that clears quickly.

Best suited to creative work, company, getting outdoors, and daytime use generally.

Terpene breakdown

Primary: Limonene · Secondary: Terpinolene · Tertiary: Pinene. This combination turns up often in cultivars that win things, and it is usually the one growers comment on when a jar is opened for the first time after curing. Limonene anchors the aroma, terpinolene occupies the middle, and pinene sits behind both — which is the part that separates this strain from others sharing its primary terpene.

Who it suits

Painkiller XL 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 50-60 days comfortably for outdoor growers across the country.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
😌Relaxed
65% of people reported feeling Relaxed
😴Sleepy
65% of people reported feeling Sleepy
😊Happy
51% of people reported feeling Happy
🤑Energetic
44% of people reported feeling Energetic
🤩Creative
43% of people reported feeling Creative
😎Uplifted
31% of people reported feeling Uplifted
🧠Focused
28% of people reported feeling Focused
🗣️Talkative
16% of people reported feeling Talkative

Strain Type

Indica 25%Sativa 75%

Strain Data Sheet

🧬THC9% - 12% (Medium)
🌿LineageSativa-Dominant Hybrid (Undisclosed Lineage)
🔬TypeFeminised Sativa
🌡ClimateWarm / Mediterranean, long season
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height60-100 cm
⚖️YieldHigh
🏠Yield Indoor500-550 g/m2
🌳Yield Outdoor500-550 g/plant
⏱Flowering Time50-60 days

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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Painkiller XL Feminised
royalkingseeds.co.uk
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💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
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🔢Scratchable serial number

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Painkiller XL 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
BX2
Generations
3+
Breeding Programme
Royal King Genetics Backcross Line — BX2 modern hybrid stabilisation
Stabilisation Notes — What This Means for Your Grow

Backcrossed twice to the dominant parental line. Painkiller XL now expresses haze-character terps consistently across the population — what made the original cross interesting is preserved without the pheno-roulette of an unstabilised F1.

Breeding Goal

Fix parent-cut traits in Painkiller XL without narrowing the population too far.

Selection Focus

Chosen for clear-headed terpene expression, structural manageability and a finish that lands inside the published window.

Pollen / Mother Source

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

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