XXX 420 Auto
Growing XXX 420 Auto in New Zealand: a indica at 18% THC, relaxed, sleepy, happy. Flowering window and height are on the page where we hold them, blank where we do not.
What the seed lot did on the bench
Every lot is checked before it goes on the shelf, and the yield figures come from New Zealand growers who sent us a harvest weight against a batch code. This lot was read on 2026-09-17, from a tray sample of 300.
Outdoor figures come from a New Zealand season, so they run below what the same cultivar reaches somewhere with a longer, drier autumn. Treat them as what this plant does here. The full report for this lot sets out the method and the terpene panel.
About XXX 420 Auto
Crack a properly cured jar of XXX 420 and caryophyllene arrives first — that is the compound doing most of the aromatic work here, carried by myrcene and rounded off with bisabolol. Terpene expression is not fixed at the genetic level; it is something you either preserve or destroy in the last fortnight and the dry. This page is about keeping it.
Protecting the Caryophyllene in XXX 420
Terpenes are volatile. That single fact explains almost every flavour disappointment growers report.
Late flower. Heat drives off the lighter aromatic compounds, so the last fortnight wants cooler nights rather than a push for size. Growers chasing the final few grams routinely trade away the thing that made the strain worth growing.
The dry. This is where most of the loss happens. Slow and cool, over a couple of weeks, in the dark, with air moving but never blowing on the flower. Fast drying strips caryophyllene first, and it does not come back.
The cure. Sealed glass, opened daily at first, held somewhere stable. Myrcene and Bisabolol tend to surface over the following month as the harsher volatiles clear.
Everything above matters more than any bottled additive claiming to boost flavour. If aroma is your priority, the indica seeds range is where to browse the rest.
Reading the Effects Honestly
Effect descriptions are the least reliable part of any seed listing, this one included. What is defensible: this is a 65/35 indica at 18% THC, commonly described as relaxed, sleepy, happy, with caryophyllene leading the terpene profile.
What is not defensible is any promise about how it will feel for you. Dose, tolerance, setting and the phenotype you happen to pop all move the outcome more than the strain name does.
Growing a few and selecting the keeper is the only way to know. That is what a pack of autoflowering seeds is for.
The Terpenes
Caryophyllene leads, myrcene sits behind it, and bisabolol runs underneath.
Temperature changes what you get. Vaporised low, around 180 to 188 degrees, myrcene and bisabolol come through cleanly while caryophyllene stays in the background. Combusted, caryophyllene dominates and the finer detail is largely lost. Same flower, two different experiences.
Who It Suits
Who does well with XXX 420? Growers with limited headroom or no interest in managing timers. Apartment balconies. Anyone wanting more than one run in a season. Anyone past their first grow.
Still deciding? The indoor-friendly genetics list is the narrower place to start.
Published Figures
- Finishes in Approximately 7–9 Weeks
- Under lights: 300 gr/m²
- Grown out: 300 grams
- Height: 90-120 cm. Medium
- Difficulty: medium
Reported Effects
Descriptive, and ordered by how prominently each one appears in the sources we hold. Not a survey, and not a measurement.
Best For
Where It Sits
The Numbers
How it arrives
Regular
Seeds
authenticity
lining
number
Related Strains
XXX 420 Feminised
XXX 420 Feminised — indica, 18% THC on the listing, relaxed, sleepy, happy. Sent in plain packaging with NZ Post tracking and covered by our germination promise.
A-Train Auto
Growing A-Train Auto in New Zealand: a indica at 21% THC, relaxed, sleepy, happy. Flowering window and height are on the page where we hold them, blank where we do not.
Ace of Spades Auto
Ace of Spades Auto for New Zealand growers. Indica, listed 20% THC, relaxed, sleepy, happy. Free postage over $150, flat $14.99 below it, both islands.
Afghan Kush Auto
Afghan Kush Auto for New Zealand growers. Indica, listed 20% THC, relaxed, sleepy, happy. Free postage over $150, flat $14.99 below it, both islands.
Where XXX 420 Auto Comes From
Documented parentage is Sweet Tooth #3 × Chemo. Where a cultivar's origin is recorded we name it on this page; where it is contested or simply unknown, the field stays empty rather than being filled with something plausible.
We did not originate the cultivars in this catalogue and do not claim to have. What we do is select and stabilise the lines we sell, so that a pack grows out more uniformly than an unworked one — which matters more in New Zealand than in most places, because an outdoor grower here is working to a frost date rather than an open-ended season. The stabilisation programme sets out how that works and what it does not cover.
Every pack is covered by our germination promise: follow the method in the germination guide and seed that fails to open is replaced free within 30 days.