You don't need an ace up your sleeve to grow Black Jack feminized seeds, a fantastically balanced hybrid, that grows into a powerful, healthy plants with earthy, intense flavors.

This award-winning Black Jack strain is also a productive plant, with impressive yields and a relatively short flowering time. Her hard buds are a must-try for anyone who calls themselves a cannabis connoisseur, and her high feels like winning the jackpot in Vegas.

Want to learn more about Black Jack feminized seeds? Keep reading and discover why Black Jack is a strain of cannabis seeds you simply have to grow at least once! If you are a first time grower, also check out our Black Jack autoflowering seeds, for an even easier grow!

Why you should buy Black Jack seeds:

  • Easy to grow

  • Less than nine weeks to flowering

  • Earthy, flowery, and pepper flavor profile

  • Powerful, yet balanced high

Growing Black Jack (indoors and outdoors)

Black Jack is suitable for virtually any grower and is classified as relatively easy to grow. In addition, our Black Jack feminized cannabis seeds are suitable for indoor and outdoor cultivation and respond well to training methods such as SOG and SCROG.

Sufficient light and warmth are essential for good results. Due to this, a little extra help from a greenhouse can be a good idea if you live somewhere with cool, short summers.

Black Jack feminized cannabis seeds will grow into beautiful large roundish marijuana plants with a fine stature and bright green leaves during the growth phase. When the flowering stage 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, as she will grow between 130 and 170 cm. Outdoors, however, the marijuana plant can grow quite large. If she were a human, she could easily play in the NBA, as she grows between 180 and 270 cm (!). Keep that in mind.

Black Jack yield

You can increase your chances of an optimal harvest by carefully applying nutrients during the vegetative phase and using the Sea of Green method. The maximum yield of Black Jack cannabis seeds, when grown indoors, is between 400-500 grams per square meter. Outdoor yields are usually better, and growers can harvest up to 500-700 grams per plant.

Effects of Black Jack

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

Black Jack is a potent weed and has 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, however she will 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 to relieve stress, anxiety, and depressive feelings.

Side effects

Prepare yourself for serious "munchies"! It is advisable to stock up on snacks before taking a gamble with Black Jack (or hide all your snacks if you are trying to watch your calorie intake). Other side effects include dry mouth and eyes. We recommend novice cannabis users take it easy since the weed can be a bit overwhelming.

Smell and taste

Black Jack is always a pleasant smoke. You'll experience a sharp but pleasant pepper flavor with an aromatic flowery 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 Jack Herer. Over the years, Black Jack 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.

The best Black Jack feminized seeds for sale at Weedseedsexpress

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

Crossing Black Domina and Jack Herer, Black Jack is among the most potent 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 the highest quality Black Jack feminized seeds at Weedseedsexpress. We offer free seeds with every order, germination and delivery guarantees, and our stellar customer support team is ready to answer any pressing questions you might have regarding our cannabis seeds.

Read morefold up

Specifications Black Jack feminized seeds

THC level 21%
CBD level 0.6%
Variety 50% Indica / 50% Sativa
Genetics Black Domina x Jack Herer
Max yield indoor 400 to 500 grams/m²
Max yield outdoor 500 to 700 grams/plant
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

Black Jack feminized strain review

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

Write a review

Tell us what your experience is with Black Jack feminized seeds and help other growers!

Failed to sent review

Thanks for your review!

We will never publish your email address

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.

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

We offer the following payment methods:

  • Visa - Pay easily, safe and instant with your Visa. We offer this payment method in most countries, but unfortunately some countries are excluded.'

  • Mastercard - Pay easily, safe and instant with your Mastercard. We offer this payment method in most countries, but unfortunately some countries are excluded.'

  • Zelle - Pay easily with Zelle. It's fast, safe and very easy. If you choose this option, you will receive an email after completing your order with instructions to make your payment.'

  • Cash App - Cash app is gaining in popularity. It's practical, fast and safe! Do you choose this payment method? Then you will receive an email with instructions after completing your order to make your payment.'

  • ACH - This is the easiest and safest payment method we offer. All you need to do is add your routing number, checking account number, name of account holder and checking / saving account.'

  • Bank - We have a bank account in several continents. If you are not in one of these locations, a fee may be charged by your bank. It also takes longer for the payment to be transferred to our bank account.'

  • Crypto - Want to pay in a fast and discreet manner? A payment with cryptocurrency is completely anonymous and is without any fee (no banks involved).'

  • Cash - Sending cash is totally anonymous and without any fees. Make sure you send cash with registered tracked mail.'

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

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.

Black Jack feminized alternatives

These weeds seeds are a great alternative for Black Jack feminized seeds

Black Jack feminized seeds


Select your pack:

Add to cartadding to cart

Our secure payment options