Black Jack Feminized

(35 customer reviews)

Black Jack Seeds are a cannabis strain with approximately 50% Indica and 50% Sativa properties.





Black Jack Feminized Strain information


Caryophyllene, Ocimene, Terpinolene


Focused, Happy, Relaxed

Strain Type





> 78 in

Yield (oz/ft2)

1 – 3

Flowering Time

8 – 9 weeks

Harvest Month


Pack Size

6, 12, 24


Premium Cultivars

35 reviews for Black Jack Feminized

  1. Leanne Gossett

    I think I’m out of this world when I tried this strain. And I think that’s a good thing.

  2. Paul Weber

    Great for indoor cultivating. Best seeds I’ve ever purchased.

  3. Devin Hickerson

    It’s amazing how these seeds can grow indoors. Another worthy purchase from premium cultivars.

Add a review

Your email address will not be published.


The History of Black Jack Feminized Seeds

Black Jack Seeds are a product of crossbreeding Black Domino and Jack Herer. The resulting powerhouse strains are considered a predominantly Indica hybrid. Black Jack Seeds grow into strong plants and can rise quite tall when produced outdoors. These feminized seeds are resistant to mildew and mold and have a short blooming period of 56 to 63 days, making them ideal for cultivating.

How to Germinate Black Jack Feminized Seeds

Germinating Black Jack seeds requires a simple process called the paper towel method. It is the easiest and most cost-effective germinating method since the needed materials are readily available. Premium Cultivars recommend the paper towel method to cultivate feminized seeds. Below are the steps involved in the process.

  1. Collect all the materials you need: Black Jack Seeds, paper towels, water, a plate, and a pair of tweezers.
  2. Wet the paper towels with water and wring away any excess moisture
  3. Place one paper towel on a plate and store the other for later use.
  4. Arrange your Black Jack Seeds one inch apart from each other.
  5. Use the other dump paper towel to cover the seeds and add water to dampen the paper towels
  6. Carefully the paper towel beneath and check the plate for excess water. Drain away any excess water.
  7. Place the dish in a dark and warm place like a closet for about one to three days until you see a taproot.
  8. Regularly check on your seeds and add water so that the seeds don’t dry
  9. Once the taproot props, use a pair of tweezers to carefully pick your germinated seeds and transfer them to soil or hydroponic media.

Why are Feminized Seeds Better than Regs?

Feminized seeds are a preferred choice for most breeders and seed banks because they have various benefits. With feminized seeds, you have a 99% guarantee that your plants will bloom. Since the seeds are feminized, it eliminates the need to separate male and female plants. Feminized seeds are available in a wide variety and have reliable and consistent genetics.

Growing Black Jack Feminized Seeds

Black Jack seeds grow into strong plants with a Sativa/Indica ratio of about 50:50. The plant is resistant to mold and mildew and has a quick flowering time, making growing less complex. You can grow black Jack Seeds indoors or outdoors, but outdoor growing is best for higher yields. These feminized seeds can also thrive indoors, provided there is adequate lighting. However, Black Jack Seeds will grow to heights of up to 270 cm when grown outdoors and a maximum height of 130-170cm when cultivated indoors.

Should I Grow Black Jack Feminized Seeds Indoors or Outdoors?

Black Jack seeds can flourish indoors and outdoors, but the plant’s height varies based on the environment.

Growing Black Jack Feminized Seeds Indoors

Black Jack seeds can grow to maximum heights of 130 to 170 cm when grown indoors and yield about 500 g of buds per square meter. That is when the plant receives adequate sunlight in an indoor setup.

Growing Black Jack Feminized Seeds Outdoors

Outdoor growing of Black Jack seeds allows the plant to reach heights ranging from 180 to 270 cm.

How Much do Black Jack Feminized Seeds Yield?

How to Get Better Yields From Black Jack Feminized Seeds

Grow your Black Jack Feminized seeds outside to obtain higher yields. When produced outdoors, Black Jack Seeds can yield about 500g to 700 g per square meter. Using soil as the growing medium for outdoor gardening and a hydroponic setup for indoor gardening increases your harvest.

The Best Grow Medium for Black Jack Feminized Seeds

A hydroponic setup is the best growing medium when growing Black Jack Feminized seeds indoors. But for outdoor gardening, consider using soil.

The Best Climate for Black Jack Feminized Seeds

Black Jack seeds thrive in a warm climate and areas that receive adequate sunlight.

Problems to Look Out For when Growing Black Jack Feminized Seeds

Any issues with your cannabis plants often manifest through the leaves. For example, browning or yellowing on your leaves is a possible sign of nutrient deficiency. However, there are different nutrient deficiencies, meaning that pinning discoloration to one type of deficiency can be difficult.

White mildew may also form on your cannabis plants. Establishing the cause of white powdery mildew is crucial to prevent the problem from recurring. Other issues to look out for include root rot, pests, and bugs.

How Difficult is it to Grow Black Jack Feminized Seeds?

Are Black Jack Feminized Seeds Suitable for Beginners?

Growing Black Jack seeds is not complex; the plant has a short flowering time of 56-63 days and can thrive indoors and outdoors.

The Best Grow Techniques for Black Jack Feminized Seeds


When left untrained, cannabis plants grow tall and thin, concentrating most of their resources in one stem. That can result in small stalks and immature buds of poor quality. Topping is a technique that entails cutting off the top branches of a plant to promote its overall growth and production. The method is crucial during the vegetative stage of your Black Jack Feminized seeds.

Low-stress training

Low-stress training involves bending the stems of your cannabis plants to control their growth. The technique is beneficial when growing your Black Jack Feminized seeds indoors, where space and lighting may be a challenge. Low-stress training lets you control the direction your plants grow to maximize available room and light.


Lollipopping is a gardening technique whereby you remove the lowest buds for the plant to focus all its resources on the highest bud spots. This method lets you get big, thick buds out of your Black Jack seeds.

Are there Similar Seeds to Black Jack Feminized Seeds for Sale Online?

Other Seeds similar to Black Jack Feminized Seed include Bruce Banner Feminized, Berry White Feminized, Bubble Gum Feminized, and Black Domina Feminized.

Where Can I Buy Black Jack Feminized Seeds?

High-quality Black Jack Feminized Seeds are available online at Premium Cutivars – a leading seed bank known for premium cannabis seeds.

How Do I Buy Black Jack Feminized Seeds?

Buying Black Jack Feminized seeds is a straightforward process. First, log into our Premium Cultivars website and check if Black Jack seeds are in stock. Once you have confirmed their availability, you can place your order. Cannabis seeds are available in different quantities, including packs of 6, 12, and 24. We are flexible regarding payment methods; you can pay using all major credit cards. There are no delivery charges for all orders above $100.

Here is 10% Off

Enter your email address and we will send you a coupon for a 10% discount on your 1st order with us!

Product Reviews

35 reviews for Black Jack Feminized

  1. Leanne Gossett

    I think I’m out of this world when I tried this strain. And I think that’s a good thing.

  2. Paul Weber

    Great for indoor cultivating. Best seeds I’ve ever purchased.

  3. Devin Hickerson

    It’s amazing how these seeds can grow indoors. Another worthy purchase from premium cultivars.

Add a review

Your email address will not be published.


Payment Options

We accept all major credit and debit cards. Visa, Mastercard, American Express and Discover. 

Shipping Info

For orders over $100 we offer free shipping to all US states. Most orders are expected to arrive within one week of dispatch in discreet packaging!

Buy from the Experts

We only sell the best cannabis seeds sourced from the best breeders to guarantee the perfect product. All the products sold by Premium Cultivars are just that, premium quality.

Pick your Seeds

Feminized Seeds are guaranteed to grow into female cannabis plants, ruling out any chance of males in your garden! Grow these seeds with 12 hours of light per day and watch those flowers bloom. You can harvest fems outdoors in the Fall and indoors after around 15-20 weeks of growth.

Autoflower Seeds are small, easy-to-grow seeds that are perfect for beginners and new growers! Better still, you can harvest these beans in just 10 weeks! These are the best seeds if you’re a novice grower or even a veteran grower low on space.

Germinating your Seeds


The Best Seeds at the Best Prices

Premium Cultivars sells top-shelf cannabis seeds at reasonable prices. Nothing means more to us than our customers! We believe that everyone deserves the very best when it comes to cannabis seeds.

Black Jack Feminized $99.00$199.00