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Critical Jack by Silent Seeds is the legacy of Dinafem's Critical Jack. It is created from the same clones as Dinafem's famous Critical Jack. Now this same variety is back from the hand of Silent Seeds, keeping the original mothers and developing the same genetics that Dinafem made famous.

Critical Jack Feminized by Dinafem

Critical x Jack Herer

Critical Jack Feminized by Dinafem

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Information on Critical Jack


Critical Jack is obtained from the crossing between Critical + and Jack Herer from Sensi Seeds, sativa cannabis plant of large production that flowers in 70 days with a THC level close to 21%.

Critical + arises from the crossing between a Big Bud, developed in the American West Coast, and a Skunk. It has become the best known and cultivated strain of marijuana in Spain between 2008 and 2009. Such was his fame that it can be compared with the arrival of Skunk to U.S. at 90's.

Mr Nice Seed Bank crossed these two strains and Critical Mass came. We would like to thank Shantibaba, Neville and Mr. Nice for their excellent work.

Critical Jack has a fast growth with a significant internodal distance, ungainly sativa aspect and very large light green leaves hanging limply. The flowering period of 60 days, fast for a sativa marijuana plant, and the explosion of flowers completely coated with huge resin is due to the contribution of Jack Herer cannabis strain of Sensi Seeds, who we also appreciate his work .

The effect of Critical Jack is a mix between balanced and psychoactive (Critical + x Jack Herer).

The flavor is sweet and intensely fruity but some plants may drift into a lemony and woody flavor.

Very productive marijuana plant, even more than Critical. It is very resistant to humidity and fungus. In outdoors cultivation it can be harvested in late September.

Features of Critikal Jack

  • Days of flowering to 12 hours: 55 - 65.
  • Harvest outdoors: From September 30 to October 15.
  • THC: Very high (14% - 18%).
  • CBD: Medium.
  • Production: Very high.
  • Height in outside: Up to 3 meters.
  • Composition: Sativa-Indica, 50%. Genotype: Critical + x Jack Herer (Sensi Seed Bank)

Specifications on Critical Jack


Feminized Seeds check
Seed bank Dinafem
THC Content High (15-25%)
Indica/Sativa Genotype Sativa +60%
Flavor Fruity, Sweet, Woody
Easy to grow check
Moisture/Mold Resistant check
Effect Stimulating
Outdoor harvest Standard (Autumn)
Indoor flowering Fast (-9 weeks)
Indoor yield High (500-600 g/m2)
Outdoor yield Very high (+1000 g/plant)
Genetics Critical, Jack Herer
CBD content Medium (1-15%)

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