Granddaddy Purple Auto by Royal Queen Seeds
Granddaddy Purple Auto by Royal Queen Seeds takes one of California’s best-known purple strains and gives it the automatic treatment.
RQS created this version by crossing:
Granddaddy Purple × Big Bud Auto
The result stays firmly on the Indica side, with Royal Queen Seeds listing the genetics as 75% Indica, 20% Sativa and 5% Ruderalis.
THC reaches up to 19%, while the flavour sticks closely to what you’d hope for from something carrying the Granddaddy Purple name: plenty of blueberry and ripe fruit backed by herbs and a subtle fresher edge.
At SeedMasters.com, we like this one because RQS hasn’t tried to reinvent Granddaddy Purple completely.
The classic purple-fruit character is still the reason to be interested.
An Automatic Version of a Californian Classic
Granddaddy Purple – usually shortened to GDP – has been around for considerably longer than most of the dessert strains filling modern seed catalogues.
The original strain comes from:
Purple Urkle × Big Bud
That pairing produced the unmistakably Indica-dominant Granddaddy Purple family, known particularly for its colourful appearance, sweet berry character and dense flowers.
For its automatic version, Royal Queen Seeds took Granddaddy Purple and crossed it with Big Bud Auto.
There’s a nice connection there.
Big Bud already appears in the original GDP family tree, and Big Bud Auto brings that genetic influence back into the automatic version.
Rather than introducing something completely unrelated, RQS has kept the Auto within familiar territory.
We think that’s a neat bit of breeding.
Blueberry, Fruit and Herbs
Royal Queen Seeds currently lists the main flavours as:
Blueberry · Fruity · Herbal
The blueberry is probably the note most people will associate with Granddaddy Purple.
There’s a broader ripe-fruit sweetness around it, followed by an herbal quality that stops the whole profile becoming too sugary.
RQS’s own documented example also picked up pine alongside the berry, fruit and herbal notes.
That makes sense for GDP.
This isn’t really supposed to taste like one of the modern candy-and-cream strains we’ve been covering recently. Granddaddy Purple comes from an earlier generation of American genetics.
At SeedMasters.com, we’d describe it as sweet blueberry and ripe fruit over an earthy-herbal background, with a fresher touch of pine underneath.
Simple, but very recognisable.
Up to 19% THC
Royal Queen Seeds gives Granddaddy Purple Auto a THC content of:
Up to 19%
CBD is listed as low.
That 19% figure isn’t enormous by current standards, especially when some modern autos now push well beyond the mid-20s.
We don’t think that matters much here.
Granddaddy Purple Auto isn’t really about winning a THC numbers contest. The attraction is getting the character of a famous old-school Indica family in an automatic format.
RQS describes its overall character as physically relaxing, sleepy and uplifting.
That heavier physical side isn’t particularly surprising considering the 75% Indica genetic split.
As always, cannabinoid percentages and characteristics are breeder-supplied reference information rather than a guarantee for every individual expression.
Compact and Properly Purple
Appearance is an important part of the Granddaddy Purple story.
The original became famous partly because of its ability to produce striking dark colouration, and RQS has retained that purple-family identity in its automatic version.
The flowers can show a mixture of deep green and purple tones, bright pistils and a substantial coating of pale resin.
It’s a classic combination.
Royal Queen Seeds lists indoor height at approximately 70–120cm, while its outdoor specification sits at around 80–140cm.
Flowering takes approximately 55–60 days, with the complete cycle listed at around 70–85 days.
Production figures are given as 375–450g/m² indoors and approximately 110–160g per plant outdoors.
For SeedMasters.com customers, these figures are included as breeder-supplied reference information for identifying and comparing collectible cannabis genetics.
More Than Just the Name
One thing we particularly like about this release is that Granddaddy Purple Auto isn’t completely disconnected from the genetics behind the original.
The photoperiod Granddaddy Purple family comes from:
Purple Urkle × Big Bud
RQS then creates the automatic version with:
Granddaddy Purple × Big Bud Auto
So Big Bud influence appears on both sides of the story.
That’s worth mentioning because automatic versions of famous strains can sometimes feel like very distant relatives of the originals.
Here, the family connection is a little easier to follow.
You still have the Purple Urkle influence sitting further back in the family tree, alongside plenty of Big Bud genetics and the autoflowering component introduced through Big Bud Auto.
For collectors interested in strain families rather than simply individual product names, that makes Granddaddy Purple Auto particularly easy to place.
Granddaddy Purple Auto at a Glance
Breeder: Royal Queen Seeds
Strain: Granddaddy Purple Auto
Genetics: Granddaddy Purple × Big Bud Auto
Original GDP Background: Purple Urkle × Big Bud
Seed Type: Feminized Autoflower
Type: 75% Indica / 20% Sativa / 5% Ruderalis
THC: Up to 19%
CBD: Low
Flowering Time: Approximately 55–60 days
Overall Cycle: Approximately 70–85 days
Indoor Height: Approximately 70–120cm
Outdoor Height: Approximately 80–140cm
Indoor Production: 375–450g/m²
Outdoor Production: 110–160g per plant
Flavour: Blueberry, fruit and herbs
Additional Notes: Pine can also appear in the aromatic profile
Character: Physically relaxing, sleepy and uplifting
Appearance: Compact, dense, resinous flowers with classic purple potential
Our Take on Granddaddy Purple Auto
At SeedMasters.com, we’d resist trying to make Granddaddy Purple Auto sound more modern than it is.
That’s missing the point.
The interesting part is the name sitting at the beginning:
Granddaddy Purple.
GDP belongs to an earlier era of Californian cannabis genetics, before Cookies, Gelato and Runtz seemed to appear somewhere in every other family tree.
And we think Royal Queen Seeds has made a sensible choice with the automatic version.
Crossing Granddaddy Purple with Big Bud Auto keeps Big Bud firmly involved in the genetic story rather than bringing in an entirely unrelated autoflower.
We also wouldn’t oversell the 19% THC.
There are considerably stronger autos available today.
If you’re comparing Granddaddy Purple Auto with something purely on cannabinoid numbers, there will always be newer strains with bigger figures.
But that’s not why we’d choose this one.
We’d choose it for the blueberry and fruit profile, purple-family appearance, strongly Indica-dominant genetics and the history sitting behind the Granddaddy Purple name.
That’s what gives it personality.
In a Royal Queen Seeds catalogue increasingly filled with modern American hybrids and new-generation F1s, Granddaddy Purple Auto feels reassuringly old-school.
Just in a newer automatic format.
Granddaddy Purple 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.
