Runtz Muffin XL Auto


Runtz Muffin XL Auto is one of the most potent autoflowering, with THC levels in some plants reaching 25%. It is a very fast growing strain with a very discreet size of just over one meter. Its life cycle is very short and is harvested in a total of 9 weeks. It produces large buds with lots and lots of resin, with an intense and intoxicating fruity, sweet and floral aroma. The effects are very powerful, too much even for the most accustomed. A relaxing wave of peace will make you float in a calm ocean for long hours.

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Runtz Muffin XL Auto is the version of one of the trendiest varieties in recent years, famous for both its exceptional flavor and its potent effects.

Runtz Muffin is a hybrid with Indica dominance, a cross between Runtz (Zkittlez and Gelato) and Orange Punch (Larry OG x Granddaddy Purple).

It is a very versatile strain that has given rise to some giant autoflowering plants like Skywalker OG Runtz XL Auto or Runtz XL Auto by Sweet Seeds. The main difference is that our bulk cannabis seeds are the cheapest.

How to Grow Runtz Muffin XL Auto

It is a plant that any grower will love due to its vigor and resistance. Its maximum height of 110 cm makes it very discreet and perfect for terraces or balconies.

Growers usually opt for a large pot from the beginning. Transplantation is a little stress and plants can react by slowing their growth for a few days.

From the time the seeds are germinated, you only have to wait 9 weeks to harvest championship flowers. As it is so fast, you can get up to 3 consecutive harvests during the spring and summer months.

Characteristics of Runtz Muffin XL Auto

The flowers are thick and elongated like soda bottles, with beautiful purple colors, which become more accentuated with mild temperatures towards the end of flowering. And they are very very resinous, even the nearby leaves accumulate a spectacular layer of trichomes.

The taste and aroma is a delight, you can appreciate sweet, floral and fruity touches with light citrusy hints of orange inherited from its mother Orange Punch.

The effects are potent due to its high THC level, close to 20%. It provides an energetic and very joyful high, which then slowly descends to calmer and more relaxing sensations.

The yield is high despite its compact and discreet size. Outdoors, the largest plants can produce up to 150 grams. Indoors, anyone can yield up to 550 grams per m² with a 300-350 W LED spotlight.

What we like the most

  • Very easy to grow.
  • Discreet.
  • High yield.
  • It is harvested in only 9 weeks.
  • Very potent and balanced effects.
  • Its price.

What we like least

  • Intense smell during flowering.
  • Very, very potent.

Frequently Asked Questions

Below you will find the answer to the most frequently asked questions by growers interested in this genetics:

When does Runtz Muffin XL Auto start to bloom?

The flowering begins between the third and fourth week from the germination of the seeds.

How long does it take to harvest a Runtz Muffin XL Auto from its germination?

It is a very fast autoflowering cannabis strain that is harvested in a total of 9 weeks.

How to grow a feminized Runtz Muffin XL Auto?

It is a discreet, easy, and resistant cannabis strain. Use a large pot from the very beginning to get the biggest and most productive plants.

What are the effects of bulk Runtz Muffin XL Auto?

It has very, very potent effects. After a very energetic and joyful rise, a prolonged and relaxing decline follows.

Additional information






Runtz Muffin x Ruderalis



Recommended crop

Interior and exterior

Full life cycle

Short: less than 75 days



Indoor production

450-550 g/m2

Outdoor production

100-150 g/plant

Outdoor height

0,8-1,1 m

Aromas and flavours

Floral, Fruits, Sweet


Creativity, Happiness, Relaxation


27% – 30%


Low: < 1%.


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