Culture & Grow

Have you ever heard of the black weed?

Black Beauty

Here's everything you need to know about varieties that turn black and why black cannabis is so fascinating

We already know the purple color of the weed, others will talk to you about albinism in plants but, have you heard of black cannabis? Browse any cannabis forum and you will get conflicting reports about black cannabis. Is it possible that some strains become so dark that they look black? Although relatively rare, there are black cannabis strains. However, the black / purple / dark blue color appears only under certain conditions. This is why some strains of cannabis become black.

Why do some plants become dark?

The color changes of the plants depend largely on the climate. Cannabis plants grown in warm, Mediterranean climates tend to be bright green in color. However, plants grown in cooler climates produce compounds that make them purple.

The compounds that cause this phenomenon are anthocyanins, which act as a natural antifreeze for the grass. This antifreeze helps the plant retain water escaping from the leaves by forming ice crystals between the leaf cells. The cooler the growth climate, the more anthocyanins you will get.

Plants develop their pigmentation (colors) in nature, to protect themselves from the harmful UV rays of the sun and other environmental stressors. These qualities of adaptation help to survive and procreate.

Other researchers have suggested that anthocyanins may be a form of sunscreen for the plant, protecting the leaves from certain light intensities and facilitating the absorption of other types of light.

Anthocyanins encourage plants to absorb the wavelengths of blue and green light. Basically, cannabis produces more anthocyanins in response to certain types of stress.

It is also likely that the color attracts some pollinators while deterring other pests. Just as other flowers come in a variety of colors, cannabis flowers are able to produce a wide range of hues.

Plants that suffer from drought also tend to boost their anthocyanins. All these theories suggest that anthocyanin production is a feature that helps plants adapt better and survive in specific environments.

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When we consume these compounds (called anthocyanins), they give us powerful antioxidant protection that helps us cope with stress, radiation and environmental toxins. These antioxidants are classified in polyphenols and consuming them is one of our best strategies for cancer prevention.

If anthocyanin explains why cannabis is purple, where does black come from? Well, anthocyanin in cannabis is the same compound found in plants such as black rice, eggplant, blackcurrant and black / blue tomato. Thus, the more anthocyanins a plant has, the deeper the color becomes.

Genetics of color

Environmental conditions and genetics interact with each other for regulate color. Cold climates stimulate your plants to create more anthocyanins, but some strains are more likely to create this compound than others. For example, some strains such as Black Beauty produce dark, almost black, purple leaves and buds in almost any environment.

The theory is that this particular strain has a recessive phenotype that allows it to better convert glucose to anthocyanins. Hybrids of the Black strain can generate a wide range of colors, from purple to reddish and even to white. In order for the offspring to remain black, it would have to inherit a recessive gene from each mother plant.


Anthocyanins are compounds that create red, purple, blue and black hues. However, pH plays a major role in whether or not these compounds cause a lighter red / pink color or a dark, almost black color.

Cannabis plants naturally like slightly acidic soils. However, the more acidic the soil, the more your plants will blush. Blue and purple come out of the soil with a more neutral pH.

Pink leaves, red staining - Although it looks like a nutrient deficiency, this cannabis plant suffers from too much water and a too small pot.

So, if you are looking to bring out more purple in the grass? Maintain the pH at the high end of the optimal range, from 5,8 to approximately 6,8 on the pH scale. Beware of deficiencies by the excess of nutrients.

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Does the color affect the high?

Some people find that black strains tend to be extremely psychedelic and loaded with THC. However, the color of the plant may not contribute directly to the power. On the contrary, some strains phenotypes blacks may have been selected to also produce high amounts of THC.

Indica plants, for example, tend to turn more easily to purple and are also thought to naturally produce higher amounts of THC.

Although color may or may not affect the overall consumption experience, anthocyanins have a wide range of health benefits. You have probably heard the phrase "rainbow strategy" and the importance of a colorful diet.


Well, we have to thank the anthocyanins for the reds, purples and blues in the food color spectrum. In humans, anthocyanins have the following advantages:

  • Protection against cardiovascular disease
  • antioxidant
  • Protects against cancer
  • Improved memory
  • Anti-aging
  • Immune regulation
  • Anti-inflammatory

Black cannabis strains

The following strains are known to express black characteristics:

So, if you are looking at create black cannabis ? Start with a known strain to produce black phenotypes. Put it in an intense light and keep the growing environment fresh and pleasant. Make sure your pH is closer to neutral while staying in the optimum pH for cannabis cultivation. Do not overwater. To keep black alive, avoid hybridization with a non-black strain. Your plants will likely begin to express their color during flowering as the grass ages.

Tags : Agriculture / GrowGanjaStrainWeed