Critical XXL Auto


Critical XXL Auto is one of the most complete autoflowering plants. It has everything that any grower wants from a plant, such as fast growth, discreet size, huge bud production, lots of resin, spectacular and intonse citrus and fruity flavor, very powerful effects and a very short growing cycle of only 8-9 weeks.

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Critical XXL Auto is the super-productive autoflowering version of Mr Nice’s legendary Critical Mass, one of the most cultivated strains in history. In any forum or specialized website you can see impressive follow-ups or read always favorable opinions.

It is a perfect hybrid with Indica dominance, crossing Skunk x Afghani. It is especially famous for being an outstanding plant in all its aspects.

Today it is a strain versioned by many banks, both in feminized and autoflowering version. In addition, it has served for the development of new strains of marijuana, largely inheriting its best characteristics.

How to grow Critical XXL Auto

It is one of the easiest cannabis plants to grow. It is resistant like few others, grows with great vigor in any conditions and always leaves the grower satisfied.

When conditions are favorable, it reaches a height of 1.5 meters. It is not the smallest and most discreet autoflowering, but it is one of the most productive.

It has a very short growth phase and will start flowering in only 3-4 weeks. During this short period, transplanting should be avoided, as it is stressful and the plants may stop their development for a few precious days.

At Bulk Genetics we recommend using a large pot from day one with a quality substrate. Thus, the plants will be able to reach the maximum possible size before the beginning of flowering. In total, it is harvested in about 8-9 weeks from germination, being possible to make up to 3 consecutive crops during the spring and summer months.

Characteristics of Critical XXL Auto

This genetics produces contest buds, big, megacompact and very resinous. In humid environments, good ventilation will be necessary to avoid problems with fungi.

Its aroma and flavor is faithful to that of its Critical mother, with a clear citric, fruity and skunky touch, with a background of pinaceae. Skunk hybrids are also famous for their intense odor, indoors it is advisable to use a good anti-odor system.

The effects are very powerful. It has a very psychoactive beginning inherited from its Sativa genes, but soon the sensations become very relaxing and pacifying. It is a perfect variety for late in the day.

Yields are very high, up to 200 grams outdoors and in larger plants. Indoors and with 300-350 W of LED lighting, 550 grams per m² will be achieved.

What we like the most

  • Very easy to grow.
  • XXL production.
  • It is harvested in only 8-9 weeks.
  • Relaxing and drowsy effects.
  • Price.

What we like least

  • It is very fragrant in bloom.
  • Somewhat sensitive to fungi in very humid climates.

Frequently Asked Questions

Below you will find answers to some of the most common questions asked by growers interested in this strain:

When does Critical XXL Auto start flowering outdoors?

The growth period is very fast, only 3-4 weeks.

How long does it take to harvest a Critical XXL Auto from germination?

From germination to harvest in a total of 54-63 days.

How to grow a feminized Critical XXL Auto?

It is one of the easiest plants to grow and a favorite of beginners. Indoors or outdoors, it always offers the best harvests.

What are the effects of Critical XXL Auto in bulk?

The effects are initially euphoric and energetic, but soon become very relaxing.

Additional information




Mostly Indica


Critical x Ruderalis



Recommended crop

Interior and exterior

Full life cycle

Short: less than 75 days


Very High

Indoor production

450-550 g/m2

Outdoor production

100-200 g/plant

Outdoor height

1-1,5 m

Aromas and flavours

Citrus, Fruits, Pine, Skunk


Dream, Relaxation


15% – 20%


Low: < 1%.


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