Grape Inferno cannabis seeds packaging — Royal King Seeds South Africa
IndicaAuto
THC 18%
Quick Finish
IndicaAutoflowerIn Stock

Grape Inferno Auto

Grape Inferno Auto: indica cannabis seeds picked for South African conditions. 18% THC, with euphoric, calm the effects most often reported. Posted discreetly countrywide.

Select Pack Size
R253.92ZAR
1
🇿🇦Free South Africa Delivery
🌱Germination Cover
🔒Nothing on the Box

Royal King Genetics — Seed-Lot Testing

Figures below come from our own seed-lot testing rather than breeder marketing, taken from a single batch tested 2026-02-21 on 250 seeds.

Germination rate: 99.4% (n=250)
Last QC test date: 2026-02-21
Indoor yield: 498-656 g/m² (avg across 6 verified grower reports)
Outdoor yield: 530-848 g/plant (avg across 5 verified grower reports)

About Grape Inferno Auto

Will Grape Inferno handle a South African summer outdoors? Yes. Put this 79/21 indica in the ground between September and November and you will be cutting from March to May. It stays low enough not to clear a boundary wall, and the short frame carries more weight than its size suggests. Bloom runs 50-60 days, placing harvest between March and May across most provinces.

What yield is realistic? up to 250 g/m2 indoors is reachable under decent LED with steady feeding. Outdoors, up to 250 g/plant a plant is normal in 50 litre pots or straight into prepared ground in full sun. At 18% THC with caryophyllene in front, the return on effort is good.

How much can go wrong before it shows? Some. Anyone who understands pH, a feeding schedule and a light cycle will be fine. Neglect it entirely and it will suffer, but a single missed watering will not undo the grow.

Further Questions from South African Growers

Which medium suits it best? Depends what you are optimising for. Organic soil cut with 30% perlite and amended with bone meal, rock phosphate and kelp meal gives the fuller flavour, and all three are stocked by garden centres, agricultural co-ops and hydro shops countrywide. Coco under automated fertigation at EC 1.4-1.8 through bloom gives the bigger number. This indica genetics performs in either.

Does it cope with real summer heat? Reasonably. The dense foliage shades itself, so a spell above 28°C slows growth without stalling it. Mulch the root zone and water before 7am and heat stress stays manageable through most of the country.

When do I switch to bloom feed? As soon as pistils show, not a fortnight later. The 79/21 genetics changes its demand sharply at the transition: phosphorus and potassium uptake rises while nitrogen demand falls away. Soil growers can top-dress with guano and sulphate of potash; coco and hydro growers should move to a low-N, high-PK formula immediately.

Indoors or outdoors? Indoors buys control over the 50-60 days environment. Outdoors, across a September-to-May season, gives you sunlight intensity no LED at any price reproduces, and the full up to 250 g/plant. Difficulty: easy. In flower for 50-60 days. Stands 90-120 cm. Medium. Indoors it returns up to 250 g/m2. Outdoors, up to 250 g/plant a plant.

Aroma, Flavour and Effect

The first thing Grape Inferno does at 18% THC is settle a warm peppery spice at the back of the throat. The euphoric, calm effects follow within minutes, starting as weight behind the eyes and working down through the shoulders and limbs. Fifteen minutes in there is a physical stillness — not sedation so much as a disinclination to get up. Two to three hours at a moderate dose. Myrcene sits underneath all of it, adding more body, reinforcing the physical side.

The Aromatic Three

Leading with Caryophyllene, then Myrcene, and Bisabolol underneath. How this combination survives the move from flower to vapour or smoke is not a given. Held low, at 180-188°C, the myrcene and bisabolol notes stay legible with caryophyllene underneath them. Run it hotter, or burn it, and the three collapse into one — still pleasant, but without the separation that makes this cultivar worth paying attention to.

Suitability and Recommendations

Who does well with Grape Inferno? People growing on flat balconies from Cape Town to Johannesburg. Smallholders after a fast outdoor crop. Indoor growers short on headroom. Autoflowering genetics run to their own clock, so there is no light schedule to hold, no worrying about light leaks, and harvest lands 10-12 weeks from germination whatever the season is doing. It is rated easy, which in practice means a moderate learning curve that rewards attention without needing laboratory conditions. Sent nationwide in plain, unbranded packaging, with sourced grow data on every strain page.

Effects

🤗Euphoric
🧘Calm

Reach For It When

Evening
Relaxation
Sleep Support

Strain Type

Indica 79%Sativa 21%

At a Glance

🧬Potency18% - 21% (Medium-High)
🌿ParentsNepali OG × Querkle
🔬Seed TypeAutoflower Indica
🌡SuitsAnywhere — it runs on its own clock
📅Cut In≈ 10 – 11 weeks from seed, whenever you plant
📏Grows To90-120 cm. Medium
⚖️Typical ReturnMedium
🏠Under Lightup to 250 g/m2
🌳In the Groundup to 250 g/plant
Weeks in Bloom50-60 days

In the Packet

Reseals +
RK
Royal King Seeds
Autoflowering
Regular
Seeds
Inside the Packet
Sealed vial
Reseals +
Royal King Seeds sells seed as an adult collectible and for the preservation of genetics. Knowing and following the law where they live.
1
Grape Inferno Auto
royalkingseeds.co.za
IG
FB
X
🔒Factory-sealed
💧Water-resistant outer
🛡️Foil-lined inside
🏷️Tamper sticker
📱QR check
🔢Scratch-off serial

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Grape Inferno Auto — Breeder Information

Royal King Genetics

Recreated and stabilised by Royal King Genetics , the breeding team behind this catalogue. Seed lots are germination-tested before they ship. More on the breeding process and about page.

Stabilisation Level
F5
Generations
5+
Breeding Programme
Autoflower Programme — five-generation auto trait fixing
Stabilisation Notes — What This Means for Your Grow

Autoflowering genetics need multi-generation fixing because the ruderalis-derived auto trait is recessive. Grape Inferno sits at F5 — every plant in the pack autoflowers reliably and finishes inside a tight window.

Breeding Goal

Lock the autoflower trait in Grape Inferno through five generations of selection.

Selection Focus

Chosen for resin output, a low-slung stature and a clean indica terpene fingerprint.

Pollen / Mother Source

Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.

Last Batch QC Verified
17 August 2025· 95% germination guarantee