Forbidden Runtz Auto Feminized Seeds (FastBuds)

This brand-new variety of cannabis seed from FastBuds, Forbidden Runtz Auto, is impossible to resist, so prepare yourself for the taste of the original sin. Just 9 weeks of growing will fill your jars with delightfully frosty buds that blend flavors of fruit straight from the garden of Eden with decadent earthy aromas. This Runtz version is forbidden for a reason – the 26% THC content hits hard – so we dare you to toke and think of a more potent strain. It’s going to be a challenge!

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Fast Buds
Outdoor Indoor
35% Sativa / 65% Indica
THC 26 % CBD < 1%
All characteristics

Forbidden Runtz Auto Strain Info

While the origins of Forbidden Runtz Auto remain unknown, we know one thing for sure: if it comes from a breeder like FastBuds, these cannabis seeds are sure to be a product of years of research and meticulous cross-breeding for stable genetics.


The family tree of Forbidden Runtz Auto seeds is based on Runtz genetics. You’ve probably heard about them, as after appearing on the market a couple of years ago, this Indica-leaning hybrid quickly became a number one strain in the top lists of all major cannabis media outlets. Now, Forbidden Runtz Auto continues the legacy as an improved lineage with its own twist.

Flowering Time

A true gem for impatient growers, the autoflowering Forbidden Runtz Auto is ready to harvest after just 9 weeks of growing – perfect for growing indoors all year round or outdoors in areas with short summers.


Despite its short stature, this marijuana strain produces medium amounts of top-quality bud. Indoors, you can expect to harvest up to 550g/m2 (1.8oz/ft2), while outdoor yields reach 150g (5oz) per plant.


Forbidden Runtz Auto is 65% Indica, and it shows! The effects are extremely potent and start cerebrally, often causing uncontrollable laugh riots. However, as the session progresses, you’ll feel the corporal effects take over, covering your body with warm covers of relaxation – perfect for whenever you need to calm both your body and mind.

THC And CBD Levels

FastBuds keeps breaking records with the potency of their autoflowering weed, and Forbidden Runtz Auto is no exception. The THC content of 26% is more than enough to send you floating in the stratosphere, so newbie smokers should definitely start low and increase the dosage gradually.

Smell And Taste

The flavor profile of Forbidden Runtz Auto is quite mellow and delicate. The selling point is definitely those fruity terpenes that form the base of the smoke and linger on the palate for quite some time. A great addition to this is the note of damp, fresh soil that’s noticeable in both taste and aroma.

Grow Tips

Forbidden Runtz Auto is an example of an ideal autoflowering structure. It stays stocky and short, just under 130cm (4’3”), while developing extra thick side colas that are almost as heavy as the central one.

  • Forbidden Runtz Auto seeds produce buds that are heavily covered in resin – perfect for making extractions.
  • It’s a low-maintenance strain, making it ideal for a first grow.
  • Forbidden Runtz Auto grows huge and dense buds with top bag appeal.

Forbidden Runtz Auto Seeds

Growers are crazy about Runtz varieties that never disappoint – make sure to grab your pack of seeds while stock lasts. Forbidden Runtz Auto is now available to buy from Herbies with worldwide delivery (including to the USA and UK), and you’ll also get free seeds with every order.


  • Brand Fast Buds
  • Sex Feminized
  • Flowering type Autoflowering
  • Suitable for Outdoor
  • Suitable for Indoor
  • Effect A bliss you will remember for long
  • Genetics Forbidden Runtz Auto
  • Height 90 - 130 cm
  • Yield 450 - 550 g/m² indoors
    50 - 150 g/plant outdoors
  • From seed to harvest 63 days
  • Genotype 35% Sativa / 65% Indica
  • THC 26 %
  • CBD < 1%
    • Advantages
      Very productive plant and very easy to grow
      Flavour is one of the best i grew till now very fruity with tones of cream and sweet candy truly unique!!
    • Disadvantages
      Can cause dry mouth
    • General impressions
      This amazing Forbidden Runtz Auto from Fastbuds Cali line and this strain turned out very loud .
      Buds were incredibly rock hard and super sticky surely leaning towards the indica side for the compactness..
      Being a hybrid when smoking it you first feel a euphoric and talkative mood got me creative some times too..
      After a little while you start to feel that sedative power kick in but not so strong to block me yes it can be both a day and night smoke with ease..
      Wish all growers happy growing!!!
    Photos from customers
    • Advantages
      Smells FANTASTIC!
    • Disadvantages
    • General impressions
      What a cool plant to grow💕 She didn't tower like some of the Fastbuds plants I grow but that is most likely because of my crazy training. Topping early you have 50/50 chance to screw up the plant so keep that in mind.
      I will definitely grow this plant again, why? Holy hell does this smell amazing of fruity gas. Its crazy strong. Just touch her and your sticky and you smell lol. She is just covered in frost from top to bottom. Most definitely she will be tasty, I can't wait to try it.
    Photos from customers
    • Advantages
      Cured so beautifully, smells and tastes like fruits berries and some type of sherbet dream! It hits hard too! Have you forgetting your name looool not one to smoke if you have to concentrate oh hell no she'll make you forget everything and leave you in a couch lock state of mind and body ahahaha love it can't wait to get her going again! 
    • Disadvantages
    • General impressions
      Very good plant to grow this is number 2 for me. She does better in 10l fabric pots had to try the plastic so I know what they do and I'll suggest anyone avoid them and go with fabric pots! Best outcomes! But got a lovely smoke of tropical fruits. And a lovely buzz! Makes you lean back like fat Joe.
    Photos from customers
    • Advantages
      Tasty strain
    • Disadvantages
    • General impressions
      I started the grow because I like the cross from this strain. Forbidden Fruit is one of my favorite and the cross whit Runtz give some power and higher thc percentage that's what I was searching for. The nugs are almost white from the crystals and the smell is super amazing its like super fruity Gass smell. The nugs are hard like rocks and verry powerful for this short time of grow and flowering verry happy whit this results from this strain and for sure there comes a second round whit this one. In one word fire and recommend it to every Grower who needs fast and tasty results.
    Photos from customers