Why are ny cannabis seedings leaves purple

Why Do Some Cannabis Plants Turn Purple?

Have you ever looked at some of the cannabis plants before they are harvested, dried, and cured? If you have, you would agree that there are some very exotic and beautiful varieties of the cannabis flower, such as the purple buds. You may find yourself inquiring about why this plant is taking on a purple hue, well let us set the record straight since bad information is still circling.

When individuals engage in conversation over the purple cannabis, one may get a picture in their head of the plant, which may not be what they expect. Purple hued cannabis can present itself in lighter and darker varieties which may even appear black. Despite the discrepancies in hues, purple cannabis is no less impressive than it sounds. Before we get into why the cannabis community has fallen for the purple buds, why these buds get a purple tinge.

Why Does Some Cannabis Turn Purple?

Simply put, cannabis can turn purple due to high quantities of a compound known as “anthocyanins”. The varieties of the purple hue in some cannabis buds are dependent on how much of the compound is circulating throughout the plant. Anthocyanins are considered a colorant that is responsible for the red, purple, and blue hues, which is also present in many of the fruits and vegetables that we eat as well as in many other inedible plants.

Anthocyanins are a water-soluble compound which is present in some cannabis strains. The compound can turn the cannabis leaves and buds into a variety of purples and blues which may even appear dark green and black. However, the conditions of the plants’ growth will ultimately influence how the anthocyanins will impact the actual pigments of the plant. These conditions include pH levels, temperature, and light.

If you are trying to get your plant to turn colors, you should know that colder temperatures cause a breakdown in chlorophyll. By breaking down the chlorophyll, the plant is then allowed the opportunity to display the hues it’s been hiding. Although you should also know that the quantity of anthocyanins needs to be high in order for any color to come through at all, this is determined by the genetics of the plants. Thus, getting beautiful purple plants would mean a perfect combination of genetics and environmental factors.

What Makes Anthocyanins So Special?

Research published in 2004 revealed that not only is anthocyanins responsible for the vibrant colors in many plants, fruits, and vegetables but that it also seems to enhance the “health-promoting qualities” of the substance it’s in. This could account for why the purple buds have gained popularity in the cannabis community, aside from the fact that it is beautiful to look at too.

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Anthocyanins belong to a phytochemical group known as flavonoids, which can also be found in cereals, teas, and nuts. The cannabis plant has a high quantity of two chemical groups known as cannabinoids and terpenes. Trailing shortly behind cannabinoids and terpenes in terms of quantity is the flavonoids.

Anthocyanins have been used in traditional herbal medicines for many centuries by many cultures such as Native American, Indian, European, and Chinese. These herbal medicines that were rich in anthocyanin were often derived from dried leaves, berries, storage roots, and even seeds. The compound was used as a treatment for a variety of ailments and conditions ranging from hypertension, liver disorders, bladder problems to the common cold and infections.

Reports of anthocyanins’ health benefits even include improvements in vision and the circulation of blood. However, despite these medicinal benefits, researchers are unsure as to whether the apparent health benefits are due to the compound itself or whether it is due to the synergistic interactions between anthocyanins and the other compounds found in the plants.

Myth or Fact?

Any strain can be made purple. Myth You need to choose the right strain since genetics determines anthocyanins.
The strain will go purple when deprived of nutrients (stressing the plant). Myth The cannabis plant does not turn purple due to being stressed. If you try to force the change of color by depriving the plant of nutrients, it will become sick and die.
The strain will turn purple in the cold. Myth As stated before, the cold breaks down chlorophyll which then allows the colorants from the anthocyanins to show. Be sure to avoid damaging your plant with too much cold.
Cannabis can turn purple by freezing it. Myth Flash freezing and ice water flushes are more likely to expose your plant to great risks of getting sick and dying This is the “too much cold” which you have been warned against.
The pH levels will influence the color of my plant. Fact Acidic conditions are considered to have a low pH while alkaline conditions are considered to have a high pH level. Lower pH levels are likely to bring out varieties of red, while higher pH levels will bring out varieties of blue/purple.
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Some Strains Which Are Genetically High in Anthocyanins:

  • Granddaddy Purple
  • Purple Haze
  • Critical Purple
  • Purple Kush
  • Purple Cheese
  • Strawberry Bliss
  • Purple Trainwreck
  • Strawberry Cough
  • Purple Urkle
  • Fruity Pebbles

Is Purple Cannabis Better Than the Rest?

Current research suggests that although anthocyanins may enhance medical benefits, there is not enough understanding of the compounds to definitively state that purple buds are better buds. What we do know is that purple buds are more exotic and attractive to cannabis consumers and that many consumers claim to experience more potent effects from purple buds. Professionals suggest that you do not make the hue of the plant your criteria for seeking out which strain to consume as some suppliers will sometimes use dyes to change the hue.

Stems of cannabis plants turning purple, how do I fix this?

Question: Help! My cannabis plants are young (growing in soil indoors with sunlight and my leaves are medium sized) yet my main stems are turning purple from the top downwards. Have you seen this before?

Answer: When a cannabis plant or seedling has a purple stem without any other signs of problems, it is often the result of genetics. However, sometimes you’ll see red stems (pictured below) which are often caused by light exposure (kind of like a “tan”), nutrient deficiencies, various types of stress, poor environment, or pH problems.

Wait a week or two before making any alterations if your plant otherwise appears healthy and is growing fast.

If there are no other symptoms and the rest of the plant is growing fast and healthy, red stems usually aren’t a big deal. As long as you’re continuing to take good care of your plant and responding quickly to any other problems, you should be okay.

These red stems were caused by transplant shock and overall stress, but the clone just needed some TLC and time to grow out of it.

Truly purple stems are often caused by genetics

If you believe there is a nutrient problem with your cannabis plant, for example, if your plant is also growing slowly or the leaves are discolored, then the plant may be suffering from…

Purple leaves on seedling?

My WWxBB seedling is about 4 days old and seems to be doing ok. But today I noticed the undersides of the first true leaf set is purple, and the tips of the second are a little purple as well. Also, the leaves are cupping upwards. wondering if it’s from the fan or the light being too close? I have one 60w CFL on it just a few inches away with a small little fan blowing on it. Soil is FFOF. Light is on 24/0 and temps don’t go below 65.

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Any ideas? Is this normal?


well some strains do have purple or color to them, im not familiar with wwxbb but some strains do have purple in them. if youre humidity is good, try moving the light a bit more away do you know what youre ph is .

Well-Known Member

Ph would b a good place to start. I’ve had a couple seedlings do this but they came out of it once they got more established.

White widow x blueberry?

nice selection on dirt ffof is a well liked soil by many where I’m located.

Well-Known Member

It’s white widow x big bud from female seeds. It’s not a purple strain at all so that’s why I thought it was weird. Could easily be the humidity, didn’t think about that. pH run off is 5.5 and I’m watering with 7.0-7.5 tap water, so I don’t think pH should be a problem.

Well-Known Member

My WWxBB seedling is about 4 days old and seems to be doing ok. But today I noticed the undersides of the first true leaf set is purple, and the tips of the second are a little purple as well. Also, the leaves are cupping upwards. wondering if it’s from the fan or the light being too close? I have one 60w CFL on it just a few inches away with a small little fan blowing on it. Soil is FFOF. Light is on 24/0 and temps don’t go below 65.

Any ideas? Is this normal?

Purple veins and stems say I need phosphorous.

Upper leaf curl is magnesium.

got any pictures?

Since these are the lower leaves and you did not mention this was on the new growth I would not worry. Any issues you have will be shown on the most recent growth.

On a side note I would say give them some darkness. 24/0 is not natural, would you like to be awake all day? Also if they are alone in a room, at night (dark) they will create their own c02 to possess in the daytime.