Runtz Auto by Barney's Farm

Runtz Auto delivers the candy-shop flavor of one of the most hyped modern hybrids in a plant that finishes in 65–70 days from seed. After the photoperiod Runtz became a runaway hit, Barney’s Farm crossed it with BF Super Auto #1 to create a faster, smaller version.

The numbers are bold: 27% THC, a 70% Indica / 30% Sativa balance and yields that hold up against many photoperiods. With experience and good lighting, indoor harvests reach 500–600 g/m² (1.64–1.97 oz/ft²).

Plants grow to 80–100 cm (31–39 in) indoors and 110–140 cm (43–55 in) outdoors, where each one can produce around 230–300 g (8.1–10.6 oz). The buds are coated in a thick, sticky layer of resin and carry the sweet, fruity profile that made the original famous.

Barney’s Farm worked to preserve those outrageous Runtz flavors in the auto, so the jar smells like a bag of fruit candy rather than a compromise.

Lineage: Candy Genetics with an Automatic Trigger

Runtz descends from Original Z and Gelato, two dessert-strain heavyweights known for sugary fruit terpenes and colorful, resin-heavy flowers. Barney’s Farm’s photoperiod Runtz built on that line.

BF Super Auto #1 brings the autoflowering trigger along with vigor and a robust root system. The combination keeps the dense, frosty Runtz bud and adds a short, predictable cycle.

Aroma, Flavor and Effect

The aroma is pure confectionery: sweet fruit and candy that intensifies through bloom until the whole tent smells like an open bag of sweets.

On the palate, the sugar rush continues with tropical and fruity notes. It is like biting into a handful of mixed fruit gummies on a beach in midsummer: sweet, juicy and a little tropical.

Barney’s Farm describes the effect as calming, relaxing and euphoric. The high starts with a bright, cheerful mood lift, then a warm wave of physical ease spreads through the body without fogging the mind entirely. At 27% THC it is powerful, so moderate sessions work well for newer consumers.

Growing Runtz Auto Indoors and Outdoors

Run 18/6 or 20/4 from seed to harvest; Runtz Auto flips into bloom on its own. Sow into the final container (around 11 to 19 liters, or 3 to 5 gallons) to keep early growth uninterrupted.

Indoors, the plant’s 80–100 cm (31–39 in) height fits standard tents. Start gentle LST around week 3 to open the center and push side branches up level with the main cola. Strong lighting is what moves this strain toward 500–600 g/m² (1.64–1.97 oz/ft²), as Barney’s Farm notes yields depend on experience and light. Keep humidity moderate in late flower since the buds are dense.

Outdoors, plants reach 110–140 cm (43–55 in) and produce 230–300 g/plant (8.1–10.6 oz/plant) in full sun. The 65–70 days cycle allows a spring and a summer run in many US regions.

Runtz Auto Characteristics

Strain type	Autoflowering feminized
Genetics	Runtz x BF Super Auto #1
Indica/Sativa	70% Indica / 30% Sativa
THC	27%
Effect	Calming, relaxing, euphoric
Flavor	Sweet, tropical, fruity
Aroma	Sweet, fruit, candy
Indoor yield	500–600 g/m² (1.64–1.97 oz/ft²)
Outdoor yield	230–300 g/plant (8.1–10.6 oz/plant)
Seed to harvest	65–70 days from germination
Outdoor harvest	About 65–70 days after sowing, so more than one run per warm season is possible
Height	80–100 cm (31–39 in) indoors; 110–140 cm (43–55 in) outdoors
Best cultivation technique	LST from week 3, constant 18/6 or 20/4 light, strong lighting to push yield

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