Do you want to grow a fantastic hybrid? Be surprised by this relatively unknown but unprecedented plant: the Blackjack!

Actually, it is a pity that Blackjack is so underappreciated. The Blackjack feminized seeds show all the characteristics of a well-balanced hybrid. They grow into powerful, healthy plants with earthy, intense flavors, good yields and intoxicating highs. What more could you ask for?

Why you should buy Blackjack seeds:

  • Easy to grow
  • Less than nine weeks to flowering
  • Earthy, spicy and citrus flavor profile

Growing Blackjack (indoors and outdoors)

Blackjack is suitable for virtually any grower and is classified as relatively easy to grow. Our Black Jack feminized cannabis seeds are suitable for both indoor and outdoor cultivation and respond well to training methods such as SOG and SCROG. Here, sufficient light and warmth are very important for good results. A little extra help from a greenhouse can therefore be a good idea if you live somewhere with cool, short summers.

During the growth phase, Blackjack feminized cannabis seeds will grow into beautiful large roundish marijuana plants with fine stature and bright green leaves. When the flowering phase arrives, you will see that the plant quickly transitions to developing buds that overflow with resin over time.

Flowering time

Black Jack has a relatively short flowering time that lasts a minimum of 8 and a maximum of 9 weeks (56 to 63 days). Grown outdoors in the Northern Hemisphere, your plant will be ready for harvest in October.

Plant height

Her 50% Indica to 50% Sativa ratio results in a cannabis plant with a very manageable height, making her perfect for indoor growing. Outdoors, however, the plant can grow quite large. Keep that in mind.

  • Height indoors 130 to 170 cm
  • Height outdoor 180 to 270 cm

Blackjack yield

You can increase your chances of an optimal harvest by carefully applying nutrients during the vegetative phase and by using the Sea of Green method. The maximum yield of Blackjack when grown indoors is between 400 - 500 grams/m². Outdoor yields are usually better and growers can harvest up to 500 - 700 grams/m².


With its perfect ratio of 50% Sativa and 50% Indica genetics, the highs of Blackjack are extraordinary. The mix produces an ideal effect on the mind, body, mood and appetite.

Black Jack is a potent weed and boasts a high THC content that can reach up to 21%. Its CBD content is usually around 0.6%.

The effect of the weed is anything but sleep-inducing, but will definitely make you feel relaxed. At the same time, you will experience euphoric effects, become talkative and get motivated. The high lasts quite long and is therefore ideal for daytime or evening. Moreover, this weed is often used medicinally and can provide relief from stress, anxiety and depressive feelings.

Side effects

Prepare yourself for some serious "munchies"! It is advisable to stock up on snacks before taking a gamble with Black Jack. Other side effects include dry mouth and eyes. By the way, we recommend novice cannabis users to take it easy. After all, the weed can be a bit overwhelming.

Smell and taste

Black Jack is always a pleasant smoke. Thanks to the inspired cross between Black Domina and Jock Horror, you'll experience a sharp but pleasant citrus flavor with an aromatic pine scent. Other features include a strong earthy flavor. The smoke is rich and so thick. It looks a bit like incense used in a church.


Black Jack seeds were created by crossing the Black Domina and Jock Horror. Over the years, Blackjack has won many awards, including the Argentine Outdoor Cata Cup of Cannabis Cultivators (CCCC) in 2012 and the Indoor Hydro Prize in Catalonia in 2014.

Buy Blackjack seeds at Weedseedsexpress

Feminized Blackjack seeds are an excellent choice for growers who don't want to wait too long for their harvest and are looking for a plant with unprecedented mold resistance.

Black Jack is among the most powerful and productive cannabis hybrids. She is perfect for indoor growing, but will reach her full potential especially when grown outdoors. That said, with enough sun (light) and heat, you can achieve huge harvests.

Convinced? Buy your Blackjack seeds in our online store and enjoy.

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Specifications Blackjack feminized seeds

THC level 21%
CBD level 0.6%
Variety 50% Indica / 50% Sativa
Genetics Black Domina x Jock Horror
Max yield indoor 400 to 500 grams/m²
Max 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 12 reviews


forever23 (Verified customer) 2020-07-10

just got mines ill let you know on the updates thanks

anonymous (Verified customer) 2019-09-26

Your blackjacks are doing great, 8 out of 10 sprouted. At this very moment it is the third week of growing and I can't say much about the final result but so far it seems really good. Do you have any tips on which nutriens will be best for the bjacks?

Holly (Verified customer) 2019-08-21

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.

Linda (Verified customer) 2019-04-17

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!

Girton (Verified customer) 2019-03-14

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.

Sean Granger (Verified customer) 2019-01-24

It has been worth all my money!

E. Wyatt (Verified customer) 2018-11-03

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.

Markus (Verified customer) 2018-07-06

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.

Samuel Len (Verified customer) 2018-05-28

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.

Altagracia (Verified customer) 2017-10-07

Germination the seeds was as simple as ordering.

Violet Smith (Verified customer) 2017-06-28

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.

Sammy (Verified customer) 2017-03-23

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

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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 worldwide, discreetly packaged and a guaranteed delivery.

  • Free shipping We ship to the United States for free on orders above $100.00

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

  • Delivery time - You can expect your order within 15 to 26 business days on average.

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

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What does delivery guarantee mean? - When you order from Weedseedsexpress, delivery is guaranteed. This means that in case of delivery problems we will send a new shipment free of charge.

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