Log in

Get your medical card online in minutes!

Get started
closeup of marijuana nug

Black Jack

Black Jack is a strain (cultivar) bred by a cannabis company called Sweet Seeds. This company created Black Jack by crossing the genetics of two of Sensi Seeds’ classic cultivars: Black Domina and Jack Herer. Black Jack is known to produce thick buds with huge calyxes. The effects of this potent strain are said to be heavy, so it may not be ideal for first-time cannabis growers or users.

Black Jack is an indica-dominant strain with 70% Cannabis indica and 30% Cannabis sativa. THC levels are relatively high, and the amount of CBD is extremely low.

Black Jack has a distinctive fragrance and flavor profile. It consists of florals, wood, and pine, and this is a unique blend that makes it stand out from the rest.

Find The Right Dose For You.

Get cannabis dosing and product guidance from a Leafwell healthcare provider with a one-on-one counseling appointment.

Book an Appointment








Strain types

  • 70%Indica
  • 30%Sativa


  • Woody
  • Pine
  • Floral


  • Woody
  • Pine
  • Floral


Terpenes are aromatic compounds, and every plant produces them, including cannabis. Terpenes contribute to the scent, flavor, and pigment of a plant.

Different strains of cannabis will have slight variations in the terpenes they produce. For example, some strains produce more limonene than others. As a result, different strains have different profiles, enabling users to select plants they prefer based on fragrance or taste.

  • Beta-Caryophyllene

  • Terpinolene

  • Ocimene



Black Jacks has been reported to have the following effects:

  • Euphoria
  • Uplifting
  • Motivating
  • Energizing
  • Relaxing

The following adverse effects have also been reported:

  • Headaches
  • Anxiety
  • Dry Mouth
  • Dry Eyes
  • Depression
  • Paranoia

Many people who have tried Black Jack report effects that last for a considerable time. Therefore, it’s best enjoyed on your days off. Users also said this strain uplifts their mood and makes them feel focused or motivated. However, with higher doses, body jitters and paranoia are possible and can be burdensome.

Medical Applications

Black Jack is a popular choice among people who use cannabis for medicinal reasons. Many users claim that the therapeutic effects are greater with this strain when compared to others. Unfortunately, the relief from stress and anxiety is only temporary. When Black Jack is overused, it may make these problems worse. Additionally, some reported that while Black Jack stimulated their appetite initially, this effect also faded with chronic use. If you are using Black Jack to improve these issues, it would be wise to limit your usage.
closeup of marijuana nug
Chronic Pain, Muscle Pain and Other Types of Pain

Cannabis contains anti-inflammatory and analgesic compounds that can help reduce or distract from pain, including THC, CBD, and beta-caryophyllene.

Organ Systems

  • Skeletal
  • Brain & Nervous System
  • Muscular
Nausea & Vomiting

Both THC and CBD have significant anti-emetic properties, meaning they’re shown to prevent vomiting. However, THC can cause nausea and vomiting in some at high doses, so be sure to take as small amount as you can to get the right effects.

Organ Systems

  • Digestive
Loss of Appetite

THC can stimulate the production of the hunger hormone ghrelin.

Organ Systems

  • Endocrine
  • Other

Cannabis contains THC, CBD, and many other cannabinoids, terpenes, and flavonoids that can beat stress and inflammation.

Organ Systems

  • Immune System
  • Other
Anxiety, Panic Disorders

Cannabis contains many anxiolytic (anti-anxiety) compounds that can beat stress and reduce the production of the stress hormone cortisol.

Organ Systems

  • Brain & Nervous System

THC can stimulate the release of the sleep neurotransmitter, adenosine.

Organ Systems

  • Mental / Emotional
  • Brain & Nervous System



Black Jack is an indica-dominant plant and is shorter when compared to sativa plants. However, Black Jack crops may need to be supported on a trellis because some tend to grow top-heavy.

From this, the plant cannot support its weight and may topple over. If the plant falls over, the stems could snap or become damaged. As a result, this plant could be challenging for first-time growers.

Black Jack can be grown indoors or outdoors, but remember that you may not have access to a trellis when growing this plant indoors.

Growers expect a reasonable yield of 18 to 22 ounces per square meter. For an indica plant, this is a good yield; however, plants grown indoors may produce less.

To keep Black Jack strong, ensure it has enough water and sunlight. Also, feed the soil with magnesium and calcium before it enters the flowering stage.

height icon


Black Jack can grow up to 30 to 60 inches (2.5 to 5 feet).

humidity icon

Humidity and Temperature

Like most cannabis varieties, Black Jack grows well when humidity levels are between 50% to 70% during the vegetative stage. However, reducing the humidity during the flowering stage to about 30%-40% may prevent mold from growing on the buds.
The best temperatures for Black Jack are between 70 and 85 degrees Fahrenheit (21 to 29 degrees Celsius).

cannabis icon


10 weeks. Most indicas typically finish flowering in about six to nine weeks.

Frequently Asked Questions

What is the Black Jack strain good for?

Black Jack weed is a popular choice among people who use cannabis for medicinal reasons. For example, it can help ease pain and fight inflammation.

Is the Black Jack strain an indica or a sativa?

Black Jack cannabis is 70% Cannabis indica and 30% Cannabis sativa.

How does the Black Jack strain make you feel?

With higher doses, the Black Jack marijuana strain can make people with a low tolerance for THC feel jittery or paranoid. However, users have reported feeling calm, relaxed, and uplifted at lower doses.

Related Strains
closeup of marijuana nug

10th Planet

THC 17%-20%CBD 0.56%-0.87%

closeup of marijuana nug

12 Year OG

THC 17%

closeup of marijuana nug


THC 24%CBD 0.5%