North Thunderfuck Auto Seeds by Royal Queen Seeds
North Thunderfuck Auto by Royal Queen Seeds takes its inspiration from the famous Matanuska Thunderfuck family and brings those old-school American genetics into an autoflowering format.
The official RQS cross is:
North Thunderfuck × Ruderalis
The finished variety is surprisingly balanced for an auto, with Royal Queen Seeds listing it as 50% Indica, 45% Sativa and 5% Ruderalis.
THC reaches up to 21%, while the flavour moves away from the candy, cake and dessert profiles that dominate so many modern strains.
Instead, you get:
Earth · Lime · Skunk
At SeedMasters.com, that’s probably what we like most about North Thunderfuck Auto. It feels like an older American strain that’s been brought into a modern autoflowering format without losing all of its original personality.
From Matanuska Thunderfuck to North Thunderfuck Auto
There’s a bit of history behind the unusual name.
Royal Queen Seeds describes North Thunderfuck as its take on the legendary Matanuska Thunderfuck genetic family.
Often shortened to MTF, Matanuska Thunderfuck became closely associated with Alaska and developed something of a cult reputation among fans of older North American cannabis genetics.
For North Thunderfuck Auto, RQS took its North Thunderfuck genetics and introduced Ruderalis to create the autoflowering version.
The official family tree is therefore refreshingly straightforward:
North Thunderfuck × Ruderalis
There’s no enormous list of fashionable modern parents to work through.
And that’s part of the appeal.
Earth, Lime and Proper Old-School Skunk
North Thunderfuck Auto doesn’t sound like most of the newer American varieties we’ve been adding to SeedMasters.com.
Royal Queen Seeds currently lists its flavours as:
Earthy · Lime · Skunk
The lime gives the profile a sharper citrus edge, but underneath that sits a much more traditional combination of earth and pungent Skunk.
RQS’s broader descriptions also mention citrus and pine, which fit comfortably around that core profile.
We’d describe it as sharp lime and fresh citrus over earthy, piney and distinctly Skunky genetics.
That’s quite a change from strains built around vanilla frosting, tropical sweets or creamy candy.
For anyone collecting genetics from different periods of cannabis breeding, that contrast is worth having.
Up to 21% THC
Royal Queen Seeds’ current formal data sheet lists:
Up to 21% THC
CBD is classified as low.
You’ll find some RQS descriptive material mentioning 22%, but the breeder’s current structured specification consistently uses the 21% maximum, so that’s the figure we’ve used at SeedMasters.com.
RQS describes the overall character as:
Physically Relaxing · Uplifting
That’s another interesting combination.
North Thunderfuck Auto is technically slightly Indica dominant at 50%, but there’s almost as much Sativa at 45%.
It isn’t overwhelmingly weighted in either direction.
As always, cannabinoid percentages and characteristics are breeder-supplied reference information rather than guaranteed results for every individual expression.
More Balanced Than the Name Suggests
With a name like North Thunderfuck, you might expect something completely Sativa dominated.
The actual genetic split is much more balanced:
50% Indica
45% Sativa
5% Ruderalis
We think that’s worth pointing out.
There’s enough Sativa influence for RQS to retain the uplifting side associated with the original genetics, but it’s paired with a stronger physical character.
That gives North Thunderfuck Auto a different identity from both heavily Indica-dominant autos and the more obviously Sativa-heavy varieties in the RQS collection.
Dense Flowers with Purple Potential
North Thunderfuck Auto can also be a surprisingly colourful variety.
Royal Queen Seeds describes compact, resinous flowers, and its wider material on the strain notes that darker purple shades can appear in both the flowers and surrounding foliage.
That purple potential works particularly well against the heavy trichome coverage.
Visually, it’s less about the extremely polished dessert-strain appearance of newer American hybrids and more about dense, frosty flowers with plenty of character.
RQS currently lists indoor height at:
90–140cm
Outdoor height is approximately:
120–150cm
So although this is an autoflower, it isn’t necessarily one of the smallest examples in the Royal Queen Seeds catalogue.
North Thunderfuck Auto Specifications
Royal Queen Seeds gives the flowering period as approximately:
55–60 days
The complete cycle is listed at:
70–85 days
Again, those are two different figures and shouldn’t be confused.
Indoor production is currently listed at:
500–550g/m²
Outdoor production is:
90–140g per plant
That’s a fairly substantial indoor breeder specification for an automatic variety and explains why RQS also includes North Thunderfuck Auto among its higher-production genetics.
For SeedMasters.com customers, these figures are included purely as breeder-supplied reference information for identifying and comparing collectible cannabis genetics.
A Modern Auto with Older Roots
We’ve covered quite a few RQS autos recently that originate from newer American families.
Granddaddy Purple Auto takes us back a little further.
North Thunderfuck Auto goes in another direction again.
The Matanuska Thunderfuck connection gives it an identity that’s very different from Mimosa, Runtz, Gelato and the newer dessert-inspired strains.
Even the flavour specification makes that clear.
Earth. Lime. Skunk.
There’s something reassuringly uncomplicated about it.
And for us, that’s a good thing.
North Thunderfuck Auto at a Glance
Breeder: Royal Queen Seeds
Official Name: North Thunderfuck Auto
Genetic Background: North Thunderfuck × Ruderalis
Heritage: RQS autoflowering interpretation of the Matanuska Thunderfuck family
Seed Type: Feminized Autoflower
Type: 50% Indica / 45% Sativa / 5% Ruderalis
THC: Up to 21%
CBD: Low
Flowering Time: Approximately 55–60 days
Overall Cycle: Approximately 70–85 days
Indoor Height: Approximately 90–140cm
Outdoor Height: Approximately 120–150cm
Indoor Production: 500–550g/m²
Outdoor Production: 90–140g per plant
Official Flavour: Earthy, lime and Skunk
Additional Notes: Citrus and pine also feature in RQS descriptions
Character: Physically relaxing and uplifting
Appearance: Dense, resinous flowers with potential for darker purple colouring
Notable Trait: Old-school North American heritage in an autoflowering RQS format
Our Take on North Thunderfuck Auto
At SeedMasters.com, this is one we’d choose precisely because it isn’t another Runtz, Cookies or Gelato relative.
The name might be slightly ridiculous.
The genetics aren’t.
North Thunderfuck Auto connects back to the Matanuska Thunderfuck family, one of those names that was circulating long before today’s American dessert strains took over the market.
RQS has kept the automatic version straightforward too:
North Thunderfuck × Ruderalis.
What we particularly like is the flavour.
There’s no need to turn this one into something it isn’t.
Royal Queen Seeds gives us earth, lime and Skunk, with citrus and pine appearing elsewhere in its description.
That sounds much more like the genetics North Thunderfuck Auto is supposed to represent.
The specification is impressive enough on its own: up to 21% THC, 500–550g/m² indoor production, a 70–85 day overall cycle and a nearly even Indica/Sativa split.
But we’d still put the heritage first.
If Mimosa Auto represents the bright, citrus-heavy side of modern American genetics and Royal Runtz represents the candy generation, North Thunderfuck Auto feels like something from an earlier chapter.
Earthy. Limey. Skunky. Slightly wild around the edges.
That’s exactly why we’d keep it in the SeedMasters.com collection.
North Thunderfuck Auto cannabis seeds sold by SeedMasters.com are intended strictly as adult collectible souvenirs and for genetic preservation purposes only. Please check and comply with the laws applicable in your country or region before purchasing.
