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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.
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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.
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.
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.
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.
Black Jack seeds can flourish indoors and outdoors, but the plant's height varies based on the environment.
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.
Outdoor growing of Black Jack seeds allows the plant to reach heights ranging from 180 to 270 cm.
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.
A hydroponic setup is the best growing medium when growing Black Jack Feminized seeds indoors. But for outdoor gardening, consider using soil.
Black Jack seeds thrive in a warm climate and areas that receive adequate sunlight.
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.
Growing Black Jack seeds is not complex; the plant has a short flowering time of 56-63 days and can thrive indoors and outdoors.
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 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.
Other Seeds similar to Black Jack Feminized Seed include Bruce Banner Feminized, Berry White Feminized, Bubble Gum Feminized, and Black Domina Feminized.
High-quality Black Jack Feminized Seeds are available online at Premium Cutivars – a leading seed bank known for premium cannabis 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.

Premium Cultivars is more than a cannabis seed bank—we’re a community built around quality, exclusivity, and grower success. Our mission is to deliver world-class feminized and autoflower seeds directly to home growers across the U.S., giving you access to genetics once limited to elite breeders. From legendary strains like Jealousy, Lemon Cherry Gelato,and Zoap to unique, hard-to-find cuts, every seed we offer is hand-selected for reliability and performance.
We believe growing should be simple, successful, and rewarding, which is why we focus only on feminized and autoflower seeds—ensuring every grower gets the most from their harvest without wasted time or resources. With secure credit card payments, competitive pricing, and our Premium Perks loyalty program, you’ll always have access to the best deals and rewards. Plus, our grow guides, tips, and active online community make sure you’re supported every step of the way.
At Premium Cultivars, we’re redefining what it means to buy cannabis seeds—exclusive genetics, unbeatable quality, and a grower-first approach designed to help you thrive.
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Our flower seeds are premium-quality cannabis genetics bred for exceptional growth, potency, and yield. Each seed is sourced from trusted breeders and tested for stability, germination rate, and authenticity.
Most of our flower seeds are feminized, meaning they will grow into female plants that produce buds. We also offer regular and autoflowering varieties for growers who prefer more flexibility.
Yes. All Premium Cultivars seeds come from stabilized genetics that have been carefully selected to ensure consistent performance and uniform growth.
Absolutely. We stand by the quality of our seeds with a germination guarantee when you follow our recommended germination guide.
Store your seeds in a cool, dark, and dry place, ideally in an airtight container. Avoid direct sunlight and high humidity to maintain seed viability for up to several years.
We ship to most U.S. states and select international locations where cannabis seeds are legal to purchase. Always check your local laws before ordering.
Our seeds are sold as souvenirs or for genetic preservation where cultivation is restricted by law. In areas where growing is legal, they can be germinated for personal or licensed cultivation.
We recommend using the paper towel method or direct planting in soil. Full instructions can be found on our Germination Guide page to help you achieve the highest success rate.
We offer wholesale pricing for licensed businesses and large-scale growers. Visit our Wholesale page or contact our team directly for pricing and availability.