Don Carlos by Humboldt Seed Company
Don Carlos cannabis seeds by Humboldt Seed Company bring together Blackberry OG × Humboldt Sour Diesel in a potent, Indica-dominant feminized strain with plenty of old-school Californian character.
This is an F3 original from Humboldt, listed as approximately 65% Indica and 35% Sativa. The flavour sits somewhere between dark fruit and classic Diesel, with Blackberry OG sweetness meeting the sharper, more pungent side of Humboldt Sour Diesel. There’s also an unusual pear note in there, which is probably the part that interests us most at SeedMasters.com.
Don Carlos isn’t one of Humboldt’s strains with an overcomplicated dessert profile or fashionable name. The genetics are straightforward, the flowers are seriously frosty, and the OG-meets-Sour combination does most of the talking.
Blackberry OG x Humboldt Sour Diesel
The parentage is:
Blackberry OG × Humboldt Sour Diesel
It’s a pairing that makes plenty of sense.
Blackberry OG provides the darker fruit and heavier Indica influence, while Humboldt Sour Diesel pulls things in a sharper, more pungent direction.
That contrast is important.
Without the Sour Diesel, the strain could easily have become another sweet berry-led OG. Instead, there’s enough fuel and sourness behind the fruit to give Don Carlos considerably more bite.
Humboldt has worked the variety to F3, so this isn’t simply a newly released first-generation cross either.
Blackberry, Sour Diesel and Pear
Don Carlos has one of those terpene profiles that sounds fairly conventional until you get to the last flavour.
Blackberry? Makes sense.
Sour Diesel? Absolutely.
Pear? Now we’re interested.
Humboldt lists the flavour around:
Blackberry
Sour Diesel
Sweet dark fruit
Pear
Pungent fuel
Earthy OG undertones
The blackberry gives the profile a rich fruitiness without pushing it towards tropical or candy territory.
Then Humboldt Sour Diesel comes through with that recognisable sour, fuel-heavy pungency.
The pear is the wildcard. It’s a softer and slightly fresher fruit note than blackberry, and it gives Don Carlos something we don’t come across particularly often.
At SeedMasters.com, that’s the part we’d look for when comparing it with other fruit-and-gas strains in Humboldt’s catalogue.
Frosty Green Flowers with Purple Flecks
The appearance is classic Humboldt.
The breeder describes frosty green flowers with purple specks, giving Don Carlos some colour without turning it into a strain built entirely around purple bag appeal.
Heavy trichome coverage is the more noticeable feature.
Humboldt also describes the plants as large and vigorous, with substantial flower production and an overall structure capable of carrying plenty of weight.
The flowering period is approximately 55 days, while the breeder gives an outdoor finish of roughly 25 September to 10 October.
As always on SeedMasters.com, we’d treat those dates as breeder guidance rather than guarantees.
Potent, Relaxing and Focused
Humboldt is fairly emphatic about the potency of Don Carlos, describing it simply as extremely potent.
Interestingly, the reported character isn’t purely heavy.
The breeder associates the strain with relaxation and concentration, which fits the 65/35 genetic balance rather nicely. There’s a definite Indica foundation, but the Sour Diesel influence appears to keep some mental clarity in the picture.
We’re deliberately not attaching a precise THC percentage here.
Humboldt’s current product information emphasises the high potency but doesn’t provide a consistent verified THC figure on the official Don Carlos listings we’ve checked. We’d rather leave the number out than borrow one from another retailer simply to fill the specification table.
Don Carlos at a Glance
- Breeder: Humboldt Seed Company
- Genetics: Blackberry OG × Humboldt Sour Diesel
- Generation: F3
- Seed Type: Feminized photoperiod
- Indica / Sativa: 65% Indica / 35% Sativa
- Flowering Period: Approximately 55 days
- Outdoor Finish: Approximately 25 September–10 October
- Aroma: Blackberry, Sour Diesel and fruity notes
- Flavour: Dark blackberry, pear and pungent Diesel
- Appearance: Frosty green flowers with purple specks
- Character: Relaxing and focused
- Potency: Described as extremely potent by Humboldt Seed Company
- Growth Character: Large and vigorous
Our Take on Don Carlos
At SeedMasters.com, Don Carlos feels like a proper Humboldt strain.
You’ve got Blackberry OG on one side and Humboldt Sour Diesel on the other. There isn’t a huge list of fashionable parents involved, and there doesn’t need to be.
The blackberry and Diesel combination already gives it plenty of personality.
But it’s that pear note we keep coming back to.
We see blueberry, strawberry, mango and citrus genetics every day. Pear appears far less often, particularly alongside dark berries and Sour Diesel.
We also like the fact that Humboldt has taken the line to F3. It gives Don Carlos a little more breeding history than a cross that’s appeared after a single generation and immediately been given a name.
The 55-day breeder-listed flowering period is relatively quick too, especially considering the large, vigorous character Humboldt associates with the variety.
For collectors browsing the SeedMasters.com Humboldt Seed Company range, we’d put Don Carlos somewhere between the breeder’s fruitier strains and its old-school gas-heavy genetics.
Blackberry brings the sweetness.
Humboldt Sour Diesel brings the funk.
And that little bit of pear gives Don Carlos a flavour all of its own.
Don Carlos 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.
