Blackberry Gum Auto by Seedstockers

Blackberry Gum Auto is a compact, fruit-loaded autoflower for growers who refuse to choose between flavor and speed. It combines bold berry-candy terpenes, dense purple-tinged buds and THC in the 20–26% range, then finishes the whole run in roughly 11 weeks from seed.

As an autoflower, it switches to bloom on its own. Lights can stay on 18/6 or 20/4 from start to finish, with no 12/12 flip and no long vegetative phase to manage. That makes it a straightforward option for small tents, balconies and short-summer outdoor gardens alike.

The breeder lists yields of 500–550 g/m² (1.64–1.80 oz/ft²) indoors and 100–200 g/plant (3.5–7.1 oz/plant) outdoors, which is impressive output for such a short, branchy plant.

Lineage: Bubble Gum, Blueberry and an Autoflowering Berry Parent

Seedstockers started with a photoperiod hybrid of Bubble Gum and Blueberry, two of the most recognizable sweet terpene profiles in cannabis history. That cross was then paired with an autoflowering Blueberry parent to lock in the auto trait, speed up the cycle and reinforce the deep berry character.

The result is an indica-dominant autoflower with photoperiod-grade aroma, predictable structure and dependable timing from one seed to the next.

Aroma, Flavor and Effect

Open a jar and the room fills with forest fruits over a caramel undertone: rich, sweet and unmistakably berry-led. It is the kind of aroma that tells you exactly what the strain is named for.

The flavor starts with ripe blueberry and blackberry, moves into sweet bubble-gum candy mid-draw, and finishes with a soft coffee-and-citrus exhale. It is smooth, layered and lingers on the palate long after the session ends.

With THC reaching up to 26%, the effect is a heavy, calming indica wave. The body settles, the mind goes quiet, and a long, mellow comedown rolls in. This is an evening strain through and through, ideal for winding down at the end of the day. Newer consumers should start with a small amount.

Growing Blackberry Gum Auto Indoors and Outdoors

The plant grows vigorously in its first weeks, then keeps stretching modestly through flower. It stays short and branchy, building compact lateral colas around a chunky main bud, and toward the end of the cycle it often turns a deep purple, adding real visual appeal to the harvest.

Indoors, run 18/6 or 20/4 under LED and use an airy mix, such as three parts soil to one part coco or perlite. Keep early waterings light and frequent. The breeder’s top tip is to sow directly into the final pot: autos react badly to transplant shock, and skipping that step keeps the plant on its 11-week schedule.

Outdoors, use 11–20 L (2.9–5.3 gal) fabric pots in full sun. The strain shows strong resistance to mold and pests, which makes it a reliable choice for short summers, balconies and discreet urban grows. Aggressive topping and heavy training are not recommended; gentle LST is plenty.

Blackberry Gum Auto Characteristics

Strain type	Autoflowering feminized
Genetics	(Bubble Gum x Blueberry) x Auto Blueberry
Indica/Sativa	Indica dominant
THC	20–26%
Effect	Relaxing, calming, heavy body, mellow comedown
Flavor	Blueberry, blackberry, bubble gum, coffee, citrus
Aroma	Forest fruits, caramel
Indoor yield	500–550 g/m² (1.64–1.80 oz/ft²)
Outdoor yield	100–200 g/plant (3.5–7.1 oz/plant)
Seed to harvest	About 11 weeks
Height	Short and branchy
Difficulty	Intermediate
Best cultivation technique	Direct sowing in final pot, gentle LST

FAQ