Black Jack F1 Fast Version (Sweet Seeds)

The F1 Fast Version of Black Jack is a balanced, non-autoflowering hybrid with 50% Indica and 50% Sativa genetics. One can expect yields of up to 500-600g/m² in a blooming time of 7-8 weeks. This version shortens the flowering time by one week, opening the time frame for outdoor harvests in mid September. It’s a crossing of S.A.D. Sweet Afghani Delicious Auto and an elite clone of Jack Herer.

Genetics 50% indica - 50% sativa
Parents S.A.D. Sweet Afgani Delicious Auto x Black Jack
Flowering period 7-8 weeks
THC% Medium
CBD% Unknown
Yield (indoor) 500-600g/m²
Height (indoor) Medium
Yield (outdoor) 500-700g/plant
Height (outdoor) Medium
Harvest time (outdoor) September
Available as Feminized seeds
Seed bank Sweet Seeds
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Starting from € 24.00
3 seeds € 24.00
5 seeds € 37.00
  in stock

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. 



Whenever you hear (or read) the words “elite clone of Jack Herer”, stop everything you are doing and take notice. If you have never heard of Jack Herer, you owe it to yourself to reverse this situation as soon as possible! The Jack Herer strain is one of the holy grails of Cannabis genetics. So to hear that a top-tier clone of this select sativa-dominant plant was crossed with a Sweet Afghani Delicious Auto, well, your taste buds should immediately start watering. Being that this autoflowering parent is a direct lineage of a 90% indica Sweet Afghani Delicious S1, expect Black Jack F1 Fast Version to be a prime example of a high-grade hybrid.


Sweet Seeds has managed to shorten the flowering time by one week, in regards to the original Black Jack. By crossbreeding with the ruderalis family tree, and borrowing from it the secret fast finishing gene, they not only reduced the flowering schedule, but maintained the vigor and growth pattern of a photoperiod-dependent variety. In optimum conditions, one can expect a flowering time of just 7 weeks and a harvest ranging 500-600g/m² indoors or 500-700g/plant outdoors. This strain is known for being tolerant to both over and underfeeding, and particularly resistant to mould and fungal attacks, so an excellent choice for both the beginner and the connoisseur. For the more advanced farmer, a little super-cropping will notably induce heavy side branching. Very forgiving to grow and quite rewarding to chop down!


When you light up a Black Jack F1 Fast Version joint, you will immediately notice a complex mix of flavours. Being an indica-sativa mix, take your time to sense how the different traits flow through your mouth, into your lungs. Sweet and spicy to start, then a musky pine undertone will soon emerge, leaving you off with a sour-bitter lime bouquet. The effects will also vary. The head buzz will stimulate your creativity and make you active while a body stone sets much later suggesting it may be time to take another hit.

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