Grape Inferno cannabis seeds packaging — Royal King Seeds USA
Indica
THC 18%
📈 High Yield
IndicaFeminizedIn Stock

Grape Inferno Feminized

S1 FeminizedLab Profile Available →

Well-balanced feminized indica with euphoric and calm effects and compact, resin-coated structure. Ideal for intermediate growers seeking stable genetics and strong production.

Flavor:Blueberry, vanilla, warm spice

Best for:🌙Evening🛋️Relaxation😴Sleep Support
Intermediate Grower
🧬
THC
18%
Flower
8 - 10 weeks
⚖️
Yield
Medium - High
🎯
Difficulty
Intermediate
📏
Height
Medium
🌱
Grow
Indoor / Outdoor
💡

Grower tip: Maintain strong airflow — dense indica buds risk mold in late flower

Select Pack Size
$14.99USD

Premium stabilized genetics · germination guaranteed

Generates medium–high production in both indoor and outdoor setups
Hits with clean euphoric effects that shine during evening
Indica-dominant genetics with stable, consistent phenotype

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About Grape Inferno Feminized

The most common mistake growers make with Grape Inferno is underestimating how dense the flower structure gets in weeks 6-8, leading to humidity problems inside the buds when airflow is inadequate. This is a strain that demands attention to canopy airflow in late flower — not because it is fragile, but because the dense ${indica}/${sativa} structure traps moisture if you do not proactively manage it. At 18% THC with caryophyllene-dominant terpenes, the quality ceiling is high — but you have to manage the specific characteristics of this cultivar to reach it.

Growing This Strain: Where Things Go Right and Wrong

The three most common issues growers report with Grape Inferno:

1. Nutrient timing at the flip. This cultivar shifts its feeding demand faster than many strains at the veg-to-flower transition. Growers who continue high-nitrogen veg feed for more than 5-7 days after the 12/12 switch see excess foliage development at the expense of bud formation. Switch to bloom nutrients within the first week of seeing pistils.

**2. Late-flower humidity. The dense flower structure means interior humidity can spike even when ambient RH is acceptable. Defoliate strategically at the start of week 3 of flower to open airflow paths, and keep oscillating fans moving air through (not just above) the canopy.

3. Harvest timing. With caryophyllene as the dominant terpene, the aromatic peak does not align perfectly with the trichome maturity peak. Growers chasing maximum terpene expression should harvest at 10-15% amber. Growers prioritizing potency should wait for 15-20% amber. These are different windows — know which one you are targeting.

Flowering: 9-11 weeks. Yield: 450-550g/m² indoor / 350-500g/plant outdoor. Height: Compact (2-3 ft). Difficulty: intermediate.

Effects and Use

At 18% THC, Grape Inferno delivers euphoric, calm effects with a caryophyllene-influenced character. The onset is body-first — a warmth that starts in the chest and settles into the limbs over 5-10 minutes. At moderate doses, you remain conversational and present. At higher doses, the physical weight becomes dominant and evening use becomes the natural fit. The caryophyllene dominance contributes a grounding quality that prevents the effect from feeling scattered.

Terpene Profile

Dominant terpenes: Caryophyllene (primary), Myrcene (secondary), Bisabolol (tertiary). This combination produces a flavor that rewards patience in the cure — the terpene complexity at week 4 in jars is substantially more interesting than the flat, one-note character of a rushed one-week cure.

Who Should Grow Grape Inferno

Best suited for growers who want control over their plant size and harvest timing — photoperiod genetics let you veg as long as you want before triggering flower. The intermediate difficulty rating means basic growing competence is sufficient, but attention to detail during flower produces noticeably better results. Ships discreetly to all 50 US states with our germination guarantee.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
🧘Calm
67% of people reported feeling Calm
😌Relaxed
58% of people reported feeling Relaxed
😴Sleepy
58% of people reported feeling Sleepy
😊Happy
45% of people reported feeling Happy
🤤Hungry
41% of people reported feeling Hungry
🌿Stress Relief
27% of people reported feeling Stress Relief
💆Body High
24% of people reported feeling Body High
😶‍🌫️Sedated
21% of people reported feeling Sedated

Best For

Evening
Relaxation
Sleep Support

Strain Type

Indica 79%Sativa 21%

Strain Data Sheet

🧬THC18% - 22% (Medium-High)
🌿LineageGrape Ape × Master Kush
🔬TypeFeminized Indica
🌡ClimateCool, Temperate
📅HarvestEarly - Mid October
📏Height2.8 - 4.5 ft | 83 - 136 cm
⚖️YieldMedium - High
🏠Yield Indoor12.8 oz/ft² | 363 - 526 g/m²
🌳Yield Outdoor20 - 24 oz/plant | 563 - 676 g/plant
Flowering Time8 - 10 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminized Premium
Seeds
Premium Canadian Genetics
Protective vial
Resealable +
Royal King Seeds sells seeds for souvenir and collectible purposes. Cannabis seeds are legal to purchase in the USA under the Cannabis Act (2018). Customers are responsible for understanding local laws.
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Grape Inferno Feminized
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🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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Grape Inferno Feminized — Lab-Verified Cannabinoid & Terpene Data

Independent third-party HPLC analysis. Total THC reported as max-potential (THC + 0.877 × THCA). Numbers reflect average across multiple batches; individual phenotypes may vary by 1-3 percent.

Total THC
18.1%
CBD
0.04%
Top Terpenes
Myrcene, Pinene, Caryophyllene
Test Lab
Cannalysis (CA)
2024

Grape Inferno Feminized — Real Grower Yield Reports

Yield data from US growers cultivating Grape Inferno Feminized feminized seeds — submitted with batch codes, photos, and (where available) grower-purchased lab tests. First-time growers should expect 70-85 percent of these numbers.

SetupYield
Outdoor, 15-gal fabric pot, partial shade472g
5×5 tent, 730W LED, ScrOG352g

Grape Inferno Feminized — Sourcing & Genetics

Release Era
1990s heritage
Parent Genetics
Pure Afghani-derived modern indica
Lineage Notes

Grape Inferno Feminized was bred in Spain by a respected European seed bank and selected for stability across multiple climates before reaching the US market.

Recommended US Climate

Cold-tolerant; performs well in short-season Northern states (ME, VT, MN, WI). Indoor cultivation works anywhere.

Grape Inferno Feminized — Breeder Information

Royal King Genetics

Bred and stabilized in-house by Royal King Genetics — our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read our full breeding process and about page.

Stabilization Level
F3
Generations
3+
Breeding Program
Royal King Genetics Active Selection — F3 in-progress fixing
Stabilization Notes — What This Means for Your Grow

F3 stabilization on the Grape Inferno cross. Three generations of selection have brought the population to ~80% trait homogeneity — a small percentage of pheno variance remains and is being culled in the next cycle.

Breeding Goal

Reach trait homogeneity in Grape Inferno through advanced filial refinement.

Selection Focus

Selected for purple/dark expression where present, dense bud structure, and indica relaxation profile.

Pollen / Mother Source

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

Last Batch QC Verified
May 9, 2026· 99%+ germination
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