Black Jack feminized seeds

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Black Jack is a hybrid strain that gives a powerful but balanced high. These fast-flowering cannabis seeds have an earthy flavor and peppery aroma. 

  • Up to 21% THC
  • 50% Sativa / 50% Indica
  • High fungal resistance
  • Fast flowering
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Black Jack feminized seeds
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Black Jack feminized seeds


Strain Info

THC level 21 %
CBD level 0.6 %
Type Hybrid
Ruderalis 0 %
Sativa 50 %
Indica 50 %
Genetics Black Domina x Jack Herer
Yield indoor 400-500 grams per m2
Yield outdoor 500-700 grams per plant
Height indoor 130-170 cm
Height outdoor 180-270 cm
Flowering time 56-63 days
Fungal resistance High
Grower profile Advanced
Cultivation Indoor, Outdoor, Greenhouse
Climate Mediterranean, Arid, Tropical
Flavors Earthy, Flowery, Pepper
Effects Euphoric, Focused, Happy, Relaxed, Uplifting
Terpenes Phytol, Borneol, Eucalyptol, Terpinolene, Valencene, Alpha Humulene, Beta Pinene, Alpha Pinene, Beta Caryophyllene, Linalool, Limonene, Beta Caryophyllene Oxide

Black Jack feminized seeds

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.

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