The BlackJack feminized seeds were created by crossing the Black Domina and Jock Horror. This resulted in a great mix of Indica and Sativa genes that is loved by many weed enthusiasts worldwide. Curious why? Read on and check our famous BlackJack feminized seeds.

Growing BlackJack feminized seeds

The BlackJack seeds have the growth potential of a hybrid and is suitable for both indoor and outdoor cultivation. However, with an outdoor cultivation, sufficient sunlight is very important for a good result which is actually a general rule but even more for the BlackJack. During the growth the BlackJack feminized seeds evolve to a beautiful large round-shaped marijuana plant with long branches full of large buds that run over from resin. Outdoor growers prefer to harvest preferably in October. 

However, it's important to know that the BlackJack strain is a relatively difficult to grow cannabis plant and requires quite a lot of attention. Therefore the BlackJack seeds are most likely not a suitable choice for those who have none to little experience. However, experienced growers will love the challenge of the strain. 

Blackjack strain flowering time

The flowering time is about 8 to 9 weeks and is therefore quite short. Including the growth and flowering phase the complete cycle takes about 11 - 13 weeks. 


For the cultivation it is possible to apply the SOG method (Sea of ​​Green) to optimize yields. With this method but also with methods like SCROG, the blackjack yields can reach up to 400 - 500 grams per m2. Outdoors, the BlackJack seeds can turn into cannabis plants that produce 700 grams per m2 in extreme cases. 

What is the effect, smell and taste of blackjack weed?

Blackjack weed is not a sleep generator, but a release. Consuming the weed makes people generally euphoric, talkative and with a 16% to 21% THC content result in a prolonged high. In addition, this cannabis has a calming effect which can be helpful in many ways.

Through the cross between Black Domina and Jock Horror you experience a sharp but pleasant citrus-like taste with a pungent smell of pine. A real pleasure to try.

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BlackJack feminized seeds specifications

THC Level 21%
CBD Level 0.6%
Variety 50% Indica / 50% Sativa
Genetics Black Domina x Jock Horror
Yield Indoor 400 to 500 grams/m2
Yield Outdoor 500 to 700 grams/m2
Height Indoor 130 to 170 cm
Height Outdoor 180 to 270 cm
Flowering Time 56 to 63 days
Fungal Resistance high
Growersprofile moderate
Cultivation indoor, outdoor, greenhouse
Climate mediterranean, arid, tropical
Flavors earthy, flowery, pepper
Effects euphoric, focused, happy, relaxed, uplifting
SOG suitable Yes
SCROG suitable Yes

BlackJack feminized strain review

The latest reviews on BlackJack feminized seeds, do you have experience with this strain? Share your experience with other customers and write a review about the BlackJack feminized strain.

4.5 / 5 stars out of 10 reviews


  1. Holly (verified owner)

    I must say, that I’m really happy with the customer service of weedseedsexpress. The packages did not arrive two times and still I got another package delivered. Many thanks!! I will write another review when the growing is finished.

  2. Linda (verified owner)

    Spicy weed man! Just did the first smoke session and this shit is great! Had no troubles growing, everything went great! Got the package very fast, great!

  3. Girton (verified owner)

    Really love the great customer care and genetics are very good. Your customer support is topnotch and really the best i have experienced so far in my 5 years of growing adventures so i’ll be back soon for some more orders.

  4. Sean Granger (verified owner)

    It has been worth all my money!

  5. E. Wyatt (verified owner)

    Its a great strain for growers with some experience. I can’t say the strain was hard to grow, but it requires more skills. The customservice at weed seed express is perfect even is the speed of sending.

  6. Markus (verified owner)

    The cross of two heavy strains (Black Domina and Jack) makes this strain truely amazing. BlackJ produces produce very dense frosted buds wrapped in orange hairs. During flowering the smell is pretty pungent. A bit like a straight haze. Easy growing and a reasonable flowering time.

  7. Samuel Len (verified owner)

    Blackjack has been my favorite strain for a long time now. I have been training myself with this strain for 1.5 years and am getting better. The seeds develop a plant with an above average height and large buds. Nice plant to experiment with.

  8. Altagracia (verified owner)

    Germination the seeds was as simple as ordering.

  9. Violet Smith (verified owner)

    Thanks you WSE for your support team. However, for a second cultivation, this strain was a bit to hard for me i guess. This strain is probably suitable for more experienced growers, but i got some good yields. Next time i will choose a more easy to grow strain.

  10. Sammy (verified owner)

    This BlackJack isn’t a gamble. Perfect quality seeds from which 17 out of 20 have germinated now.

Write a review

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Payment, shipping & delivery guarantee

What you can expect from us regarding payment, shipping and the delivery guarantee.

We do our utmost to deliver your order as fast as possible, with free shipping world wide, discreetly packaged and a guaranteed delivery.

  • Free shipping - We ship your order to United States (US) for free.

  • Discreetly packaged - The packages we send are very discreet without any reference to cannabis or cannabis seeds.

  • Delivery time - You can expect your order within 5 to 15 business days on average.

  • Free replacement - In the rare cases where your seeds get damaged during shipment, we will replace for free.

You can find more information about shipping on our page Shipping & delivery

We offer the following payment methods to all our customers:

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You can find more information about payments on our page Payment & processing

What does delivery guarantee mean? - Weedseedsexpress offers their customers a delivery guarantee which means that we provide a one time free re-shipment after 21 business days in case your products didn't arrive.  We can only provide this free replacement of your order with Track and Trace. The Track and Trace is necessary for both you and Weedseedsexpress to have proof of shipment and to easily track the location of the order.


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