3 - Best Overall Strain at Canarian Cannabis Cup 2010

Critical Jack (Dinafem)

Critical Jack is a cross between Critical+ and Jack Herer, providing a 60% Sativa and 40% Indica feminized hybrid. It yields large compact buds that taste like citrus fruit, incense, exotic wood and spices. It is easy to grow indoors, especially in a SCROG setup, and has a flowering time of around 9 weeks. Outdoors it can be harvested late September to mid October

Genetics 60% sativa - 40% indica
Parents Critical+ x Jack Herer
Flowering period 60 days
THC% High
CBD% Medium
Yield (indoor) 625g/m²
Height (indoor) Medium
Yield (outdoor) 1200g/plant
Height (outdoor) 3m
Harvest time (outdoor) October
Available as Feminized seeds
Seed bank Dinafem
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Starting from € 23.00
€ 23.00
1 seed € 23.00
3 seeds € 23.00

Easy Germination

Easy Germination

Cannabis Propagator

Cannabis Propagator


Zativo caters to private customers only, and does not supply commercial or industrial growers with large amounts of cannabis seeds. If we have reason to suspect that the ordered seeds are destined for growing cannabis on a larger-than-private scale, we reserve the right to dismiss that specific order. 

3 - Best Overall Strain at Canarian Cannabis Cup 2010

Critical Jack: Time-honored Jack Herer, enriched with Critical+ Genetics

Dinafem, with their classic hybridizing procedure, added Critical+ to Jack Herer to intensify the yields and shorten the flowering time to create Critical Jack.

The late, great Jack Herer (1939-2010) was a marijuana activist, fighting to change cannabis law. "Legalize It" was his motto. The sativa-dominant hybrid Critical Jack, partially named after him, generates as much spirit as he possessed. If you’re into cannabis activism, this is the strain to utilize during activist gatherings. With 60% sativa and 40% indica genetics, it will lift you up while a smooth, relaxing sensation slowly takes over.

In 60 days, your ganja flowers will fully develop and provide you with 625g/m² of buds for indoor settings, while outdoors - brace yourself - you can expect up to 1200g/plant! That is definitely one of the highest-yielding plants that Dinafem has produced, ever.

Critical Jack by Dinafem won the 1st place in the “Outdoor Sativa” category during the UCLA (Unión Cannábica Latinoamericana) cup. Also, Cracker Jack Extractions used Critical Jack during the Hempcon Cup, where they won the 1st prize in the “Best Shatter” category.

With its high THC levels, impeccable highs, intriguing history and high yields, Critical Jack was meant to be grown, man! Just make space for this tall plant, and provide her with all the required nutrition to create those dank buds with citrus and spicy aromas.

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