Watermelon Strain
Watermelon by Royal Queen Seeds doesn’t make you work particularly hard to figure out what it’s all about.
Fruit.
Lots of it.
Royal Queen Seeds created its version from:
Watermelon OG S1
The result is a heavily Indica-dominant feminized photoperiod with 80% Indica / 20% Sativa genetics and THC reaching up to 22%.
But it’s the flavour that really gives this strain its identity.
Royal Queen Seeds describes Watermelon as one of the fruitiest varieties in its catalogue, with ripe watermelon sweetness sitting right at the centre of the profile.
At SeedMasters.com, we’d say this is one of those rare occasions where the strain name actually tells you most of what you need to know.
Built From Watermelon OG S1
Rather than putting together a complicated multi-strain cross, Royal Queen Seeds started with Watermelon OG S1.
RQS then worked with those genetics to develop its own expression of Watermelon.
That’s worth explaining because an S1 is different from a conventional hybrid between two unrelated varieties.
The S1 designation refers to a first-generation selfed line, meaning the breeding work stays closely connected to the original Watermelon OG genetics rather than introducing an entirely separate named parent.
For collectors, that makes the pedigree pleasantly easy to follow.
Watermelon OG S1 is the foundation.
Royal Queen Seeds’ own selection work produced the Watermelon offered here.
Does It Actually Taste Like Watermelon?
According to Royal Queen Seeds, yes.
The official flavour fields are:
Fruity · Watermelon
And unlike strains where the product name bears only a vague relationship to the flavour, RQS repeatedly puts watermelon at the centre of its description.
The broader profile is intensely fruity and sweet, with that recognisable melon character doing most of the work.
At SeedMasters.com, we’d resist the temptation to turn that into an enormous list of tasting notes.
If you’re looking at something called Watermelon, you probably want it to taste fruity rather than like diesel, garlic or black pepper.
That’s exactly what these genetics are about.
Sweet, juicy fruit with watermelon leading the way.
Simple.
But distinctive.
Up to 22% THC
Royal Queen Seeds currently lists this strain at:
Up to 22% THC
CBD is low.
That’s a solid figure without pushing into some of the extreme numbers attached to newer American hybrids.
RQS describes the overall character as:
Calming · Physically Relaxing · Sleepy
That fits neatly with the genetic split.
At 80% Indica, Watermelon sits firmly on the Indica-dominant side of the Royal Queen Seeds collection.
The breeder also describes a euphoric quality alongside that heavier physical character, so the overall profile isn’t presented as completely one-dimensional.
As always, cannabinoid percentages and characteristics are breeder-supplied reference information rather than guaranteed results for every individual expression.
Compact Indoors, Considerably Taller Outdoors
Watermelon shows quite a difference between its indoor and outdoor breeder specifications.
Royal Queen Seeds currently lists indoor height at:
80–130cm
Outdoor height can reach:
150–200cm
Flowering is relatively quick for a photoperiod variety at approximately:
50–55 days
The outdoor finish is listed as:
October
RQS currently gives production figures of 450–500g/m² indoors and approximately 450–500g per plant outdoors.
The flowers themselves are dense and resinous, fitting the strongly Indica-dominant genetics nicely.
For SeedMasters.com customers, these figures are included as breeder-supplied reference information for identifying and comparing collectible cannabis genetics.
Watermelon or Watermelon Auto?
Royal Queen Seeds also offers Watermelon Auto, so it’s worth keeping the specifications separate.
The strain covered here is the original RQS feminized photoperiod Watermelon.
It’s based on Watermelon OG S1, contains up to 22% THC, and has an 80% Indica / 20% Sativa genetic split.
Watermelon Auto is a separate automatic variety with its own genetics and specifications.
That’s particularly important when comparing THC because the photoperiod Watermelon reaches a breeder-stated 22%, while the automatic version is listed slightly lower.
For collectors who like keeping different versions of the same strain family together, the two make an obvious pairing.
But they shouldn’t share the same product data.
At a Glance
Breeder: Royal Queen Seeds
Strain: Watermelon
Also Known As: Watermelon OG, Watermelon Kush
Genetic Background: Watermelon OG S1
Seed Type: Feminized Photoperiod
Type: 80% Indica / 20% Sativa
THC: Up to 22%
CBD: Low
Flowering Time: Approximately 50–55 days
Indoor Height: Approximately 80–130cm
Outdoor Height: Approximately 150–200cm
Indoor Production: 450–500g/m²
Outdoor Production: 450–500g per plant
Outdoor Finish: October
Flavour: Fruity and watermelon
Character: Calming, physically relaxing and sleepy
Appearance: Dense, resin-rich flowers
Notable Trait: RQS selection derived from Watermelon OG S1 with a particularly fruit-focused profile
Our Take
At SeedMasters.com, we like Watermelon because nobody needs a family-tree diagram to understand what makes it interesting.
Watermelon OG S1.
80% Indica.
Up to 22% THC.
Watermelon and fruit.
That’s pretty much the story.
And sometimes that’s preferable to a strain with six different parents and a flavour description that sounds like the contents of a supermarket.
The S1 background is probably the bit we’d highlight for collectors.
Royal Queen Seeds didn’t create Watermelon by piling unrelated fashionable genetics into the mix. The breeder started with Watermelon OG S1 and developed its own selection from there.
That keeps the identity tightly focused on the original genetic material.
We also think the flavour deserves to remain simple.
This isn’t one where we’d start inventing notes of cream, sweets, vanilla and tropical cocktails just to make the description longer.
RQS says fruit and watermelon, and that’s exactly what we’d put front and centre.
The 50–55 day flowering specification is another notable characteristic, particularly for a photoperiod strain, while the breeder-stated 22% THC keeps the numbers respectable without becoming the entire reason for the strain to exist.
For collectors browsing Royal Queen Seeds at SeedMasters.com, Watermelon is an easy strain to understand:
old-fashioned Indica dominance, a straightforward Watermelon OG background and one of the most unapologetically fruity profiles in the RQS catalogue.
There’s not much more it needs to be.
Watermelon 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.
