Diablo cannabis seeds packaging — Royal King Seeds UK
Hybrid
THC 18%
🌙 Sleep Aid
HybridFeminisedIn Stock

Diablo Feminised

Feminised PhotoperiodSee Lab Report →

Grow Diablo Feminised in the UK. Hybrid genetics at 18% THC, known for happy, relaxed, sleepy 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 2026-08-31 on 325 seeds.

Germination rate: 99.4% (n=325)
Last QC test date: 2026-08-31
Indoor yield: 478-656 g/m² (avg across 6 verified grower reports)
Outdoor yield: 480-758 g/plant (avg across 5 verified grower reports)

About Diablo Feminised

Read Diablo backwards from the harvest: up to 200 g/m2 under lights, up to 200 g/plant outdoors, with resin filling out towards 18% THC. Weight goes on evenly across the 50-60 days of bloom, with a clear surge in the last two weeks that rewards leaving the plant alone. The 40/50 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 limonene arrive.

Getting the weight out of this plant

Three stretches of the 50-60 days of bloom decide whether you reach the top of this strain's range (up to 200 g/m2 indoors, up to 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. Limonene 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: 50-60 days. Indoor yield: up to 200 g/m2. Outdoor yield: up to 200 g/plant. Rated intermediate difficulty.

Flavour, aroma and effect

Diablo arrives in stages. The first draw at 18% THC brings a bright citrus edge that lifts off the palate immediately. The happy, relaxed, sleepy 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 caryophyllene underneath adds a warmth that keeps the whole thing anchored.

Terpene breakdown

Primary: Limonene · Secondary: Caryophyllene · Tertiary: Linalool. 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, caryophyllene occupies the middle, and linalool sits behind both — which is the part that separates this strain from others sharing its primary terpene.

Who it suits

Who does well with Diablo? 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

😊Happy
72% of people reported feeling Happy
😌Relaxed
65% of people reported feeling Relaxed
😴Sleepy
65% of people reported feeling Sleepy
🤩Creative
56% of people reported feeling Creative
🤗Euphoric
47% of people reported feeling Euphoric
😎Uplifted
38% of people reported feeling Uplifted
🤤Hungry
34% of people reported feeling Hungry
😆Giggly
31% of people reported feeling Giggly
🧠Focused
21% of people reported feeling Focused

Strain Type

Indica 40%Sativa 50%

Strain Data Sheet

🧬THC18% - 21% (Medium-High)
🌿LineageBlueberry × Grapefruit × South African Landrace
🔬TypeFeminised Hybrid
🌡ClimateTemperate, adaptable
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height100 – 160 cm (typical)
⚖️YieldMedium
🏠Yield Indoorup to 200 g/m2
🌳Yield Outdoorup to 200 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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Diablo Feminised
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Diablo 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
F3
Generations
3+
Breeding Programme
F3 Refinement Programme — three-generation selection
Stabilisation Notes — What This Means for Your Grow

Diablo runs through our F3 programme. Most of the pack expresses the target trichome production cleanly; the F3-to-F4 cycle is where we close out the last remaining off-types.

Breeding Goal

Stabilise Diablo across three rounds toward F4 production-ready stock.

Selection Focus

Chosen for trichome density, bud structure and the hybrid trait balance the cross was engineered for.

Pollen / Mother Source

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

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