XXX 420 cannabis seeds packaging — Royal King Seeds South Africa
IndicaAuto
THC 18%
Quick Finish
IndicaAutoflowerIn Stock

XXX 420 Auto

XXX 420 Auto: indica cannabis seeds picked for South African conditions. 18% THC, with relaxed, sleepy, happy the effects most often reported. Posted discreetly countrywide.

Select Pack Size
R220.04ZAR
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 2026-03-29 on 500 seeds.

Germination rate: 96.1% (n=500)
Last QC test date: 2026-03-29
Indoor yield: 434-586 g/m² (avg across 14 verified grower reports)
Outdoor yield: 490-736 g/plant (avg across 5 verified grower reports)

About XXX 420 Auto

XXX 420 announces itself in a fixed order, and caryophyllene is always first out of the jar — warm pepper that registers as heat rather than as smell, with dried clove and sandalwood beneath. myrcene follows mid-palate, adding an earthy floor. The lab figure on this 65/35 indica is 18% THC, though potency is the least interesting thing about it — plenty of cultivars test the same and taste of very little.

Growing for Aroma Rather Than Weight

The choices that bring out the Caryophyllene/Myrcene/Bisabolol profile in XXX 420 are not the choices that maximise yield, and at some point you have to pick one. The aromatic version starts in living soil — microbial activity in an established no-till bed produces secondary metabolites a synthetic feed schedule never will, and South Africa has enough good local compost and worm-casting suppliers to make that affordable rather than aspirational.

Through Approximately 7–9 Weeks, stop foliar spraying after week two: anything that lands on a developing trichome is still there at harvest. The closing three weeks decide which terpenes end up in front — nights held at 16-18°C push caryophyllene forward, a warmer finish protects the lighter bisabolol top notes, and you cannot have both. Decide which version of the strain you want before you get there.

Most of the loss happens after the cut. Hang for 10-14 days at 15-18°C and 55-60% humidity, which through a South African summer realistically means a climate-controlled room or a wine fridge set to 16°C. Then jar it and burp twice daily for the first fortnight. The myrcene layer that makes this cultivar worth the trouble does not surface until somewhere between day 21 and day 28 in glass.

Difficulty: medium. In flower for Approximately 7–9 Weeks. Stands 90-120 cm. Medium. Indoors it returns 300 gr/m². Outdoors, 300 grams a plant.

Aroma, Flavour and Effect

The first thing XXX 420 does at 18% THC is settle a warm peppery spice at the back of the throat. The relaxed, sleepy, happy 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 XXX 420? 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 medium, 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

😌Relaxed
😴Sleepy
😊Happy

Reach For It When

Evening
Relaxation
Sleep Support

Strain Type

Indica 65%Sativa 35%

At a Glance

🧬Potency18% - 22% (Medium-High)
🌿ParentsSweet Tooth #3 × Chemo
🔬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 ReturnTypical for type
🏠Under Light300 gr/m²
🌳In the Ground300 grams
Weeks in BloomApproximately 7–9 Weeks

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
XXX 420 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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XXX 420 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 Stabilisation (F5) — ruderalis trait fixing
Stabilisation Notes — What This Means for Your Grow

XXX 420 is our F5 autoflower line. Five rounds of selection have fixed both the autoflower trigger and the purple expression the cultivar is known for. The recessive ruderalis trait demands this depth of work to express uniformly.

Breeding Goal

Lock the autoflower trait in XXX 420 through five generations of selection.

Selection Focus

Chosen for trichome coverage, stout structure and consistent flowering time across the pack.

Pollen / Mother Source

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

Last Batch QC Verified
20 September 2025· 95% germination guarantee