Big Devil cannabis seeds packaging — Royal King Seeds UK
HybridAuto
THC 18%
😊 Beginner Pick
HybridAutoflowerIn Stock

Big Devil Auto

AutoflowerSee Lab Report →

Grow Big Devil Auto in the UK. Hybrid genetics at 18% THC, known for euphoric, creative, energetic effects.

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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 2026-09-04 on 250 seeds.

Germination rate: 96.7% (n=250)
Last QC test date: 2026-09-04
Indoor yield: 448-578 g/m² (avg across 16 verified grower reports)
Outdoor yield: 674-986 g/plant (avg across 7 verified grower reports)

About Big Devil Auto

Where you grow Big Devil in Britain matters less than when you start it. This is one temperate maritime climate with a real north-south gradient: the south coast opens and closes its season around a fortnight either side of the central belt or upland Wales. Heat is almost never the constraint here. The wet finish is — rain sitting in dense flower through late September and October is what starts botrytis, and it ends more British outdoor crops than every insect on the plot combined. That puts the 9 weeks seed to harvest flowering window and the bud structure ahead of everything else on this page. Under lights none of it applies: daylength, temperature and humidity are yours to set, and Big Devil can be run anywhere in the country on its merits.

The pressures on a British grow are fairly predictable. Damp is the first of them: botrytis in dense flower from September on, answered with open bud structure and moving air rather than with a spray. Indoors it is spider mite and thrips that arrive, and humidity above 60% in late bloom is what turns a contained problem into a lost room. Outdoors in a wet spring the slugs take more seedlings than every insect put together, and they do it overnight.

Flavour, aroma and effect

Big Devil arrives in stages. The first draw at 18% THC brings dry pepper that registers at the back of the throat. The euphoric, creative, energetic, 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 — a small dose carries an afternoon, a larger one turns into an evening. The limonene underneath adds a lift that stops it turning heavy.

Terpene breakdown

Primary: Caryophyllene · Secondary: Limonene · Tertiary: Myrcene. 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. Caryophyllene anchors the aroma, limonene occupies the middle, and myrcene sits behind both — which is the part that separates this strain from others sharing its primary terpene.

Who it suits

Who does well with Big Devil? Balcony growers in flats from Brighton to Glasgow. Anyone wanting one quick outdoor crop rather than a long project. Indoor growers short of headroom. The autoflowering genetics run on their own clock, so there is no light schedule to manage, no anxiety about light leaks, and harvest comes 10-12 weeks from germination whatever the season is doing. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
🤩Creative
70% of people reported feeling Creative
🤑Energetic
57% of people reported feeling Energetic
🧘Calm
53% of people reported feeling Calm
😌Relaxed
45% of people reported feeling Relaxed
😊Happy
38% of people reported feeling Happy
😎Uplifted
31% of people reported feeling Uplifted
🤤Hungry
27% of people reported feeling Hungry
😴Sleepy
24% of people reported feeling Sleepy

Strain Type

Indica 44%Sativa 56%

Strain Data Sheet

🧬THC18% - 22% (Medium-High)
🌿LineageAutoflowering Balanced Hybrid (Undisclosed Lineage)
🔬TypeAutoflower Hybrid
🌡ClimateAll climates (adaptable)
📅Harvest≈ 10 – 11 weeks from seed (typical)
📏Height100-150 cm
⚖️YieldHigh
🏠Yield Indoor400-550 g/m2
🌳Yield Outdoor40-250 g/plant
⏱Flowering Time9 weeks seed to harvest

Packaging

Resealable +
RK
Royal King Seeds
Autoflowering
Regular
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
Big Devil Auto
royalkingseeds.co.uk
IG
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🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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Big Devil Auto — 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
Generations
5+
Breeding Programme
Royal King Genetics Auto Line — recessive trait stabilisation
Stabilisation Notes — What This Means for Your Grow

Big Devil is an autoflowering line that has been progressed through five rounds of Royal King Genetics autoflower stabilisation. The autoflower trait is recessive — fixing it takes multi-generation work — and at F5 the auto trigger and finish window are welded across the pack.

Breeding Goal

Reach auto trigger and finish-window uniformity for the Big Devil pack.

Selection Focus

Chosen for hybrid frame, clean terpene expression and consistent yield across the population.

Pollen / Mother Source

Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.

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