Forbidden Runtz Auto is the XL version of Growers Choice’s Forbidden Runtz, an autoflower selected for higher yields than a standard auto. It crosses Forbidden Fruit with Runtz, two strains famous for their candy-sweet terpenes.
The breeder selected this line for an ultra-high terpene profile, and it shows. The genetics come out at 70% Indica / 30% Sativa with 27–30% THC and a medium CBD rating, combining dessert-shop flavor with a hard-hitting indica punch.
The plant keeps an average height of 90–120 cm (35–47 in) indoors and outdoors and does not stretch excessively. Growers Choice lists indoor yields of 550–650 g/m² (1.80–2.13 oz/ft²) and 100–200 g/plant (3.5–7.1 oz/plant) outdoors.
Bloom itself is short at around 8 weeks, and the full cycle takes about 11 weeks from seed. Outdoors, the breeder lists harvest in the last week of September.
Flavor and Effects: Candy Fruit With a Heavy Hand
Growers Choice keeps the description short: very sweet and fruity, with a strong smoke. In practice that means a candy-shop nose of ripe tropical and stone fruit from Forbidden Fruit, layered with the sugary Runtz sweetness. It is like a bag of fruit candy that has been sitting in the sun: syrupy, juicy and impossible to ignore.
The smoke is full and dense rather than light, and the fruit stays on the palate long after the exhale.
The high reflects the indica-heavy genetics. A wave of happy, contented euphoria comes first, then a strong body heaviness rolls in and anchors you in place. It is a classic evening strain for winding down after a long day.
At 27–30% THC it delivers a knockout punch that outpaces many autos. Go easy at first.
Growing Forbidden Runtz Auto
The breeder calls this a grower’s dream. It handles high and low temperatures, responds well to different nutrient levels and has high mold resistance, so it suits beginners and veterans alike. Start in a final 11–15 liter pot and keep 18/6 or 20/4 light from germination to harvest, with no 12/12 switch.
Use gentle LST in weeks two to four to spread the canopy, which helps this XL auto fill a larger footprint. Feed a little more generously than a standard auto during bloom to support its bigger harvest.
Outdoors it tolerates both warm and cold climates. A late spring sowing typically finishes before fall weather turns, and the breeder places outdoor harvest in the last week of September.
Forbidden Runtz Auto Characteristics
| Strain type | Autoflowering (feminized), XL high-yield version |
| Genetics | Forbidden Fruit x Runtz |
| Indica/Sativa | 70% Indica / 30% Sativa |
| THC | 27–30% |
| CBD | Medium |
| Effect | Happy euphoria, heavy body relaxation |
| Flavor | Very sweet and fruity, strong smoke |
| Indoor yield | 550–650 g/m² (1.80–2.13 oz/ft²) |
| Outdoor yield | 100–200 g/plant (3.5–7.1 oz/plant) |
| Seed to harvest | About 11 weeks (around 8 weeks of bloom) |
| Outdoor harvest | Last week of September |
| Height | 90–120 cm (35–47 in) indoors and outdoors |
| Climate | Warm and cold climates |
| Mold resistance | High |
| Best cultivation technique | LST with slightly heavier bloom feeding |
FAQ
What does XL mean for Forbidden Runtz Auto?
It is Growers Choice’s high-yield XL auto version, selected to produce more than a standard autoflower.
How long does Forbidden Runtz Auto take from seed to harvest?
About 11 weeks in total, with a short bloom of around 8 weeks. Keep 18/6 or 20/4 light the entire time.
How strong is Forbidden Runtz Auto?
THC is 27–30%. It is indica-dominant and hits hard, with a strong body effect after a euphoric start.
What does Forbidden Runtz Auto taste like?
Very sweet and fruity, like fruit candy, with a full, strong smoke.
How much does Forbidden Runtz Auto yield?
Indoors 550–650 g/m² (1.80–2.13 oz/ft²) and outdoors 100–200 g/plant (3.5–7.1 oz/plant).
Is Forbidden Runtz Auto easy to grow?
Yes. It handles high and low temperatures, tolerates varying nutrient levels and has high mold resistance.
