The Many Colors of Weed [Complete Guide]

Whether you like to admit it or not, your eye is drawn to ‘pretty’ patterns and bold colors. Don’t believe me? Imagine if two bowls of food were set in front of you. Plate A is filled with bright, beautiful colors, while Plate B contains nothing but dull and dark food. Assuming you have no idea what’s on either plate, you’ll normally choose Plate A because it looks colorful and vibrant.
It’s the same story at the marijuana dispensary. You are always going to be drawn to beautifully colored cannabis. We usually associate weed with the color green, but in reality, strains such as Critical Kush, Grape Ape, Panama Red, and Serious Six consist of several colors including pink, purple, blue, red, and orange.
In the modern era, breeders have noted that the public prefers colorful cannabis, and they are creating new strains accordingly. However, what is the reason for the different colors of marijuana?


Phytochemicals are biological compounds found in plants, and they are responsible for the various colors of weed. It is a myth that strains with bold colors are more potent than those with less noticeable hues. In reality, although bright colors are more attractive, it doesn’t mean your weed will taste better or provide you with a more psychoactive high. This is because color doesn’t dictate a marijuana plant’s cannabinoid content; the true indicator of strength.
The other key element of cannabis color is the humble pistil. Each female plant contains an enormous amount of these tiny hairs that cover the buds. These hairs catch the pollen that comes out of the calyx during the vegetative stage and remain white until the latter part of the flowering stage. At that point, the pistils change color. Depending on the strain, a plant’s pistils can turn a burnt orange color or even become fire red. Make sure no more than 70-80% of pistils have changed color before you harvest.
Now, let’s take a look at the best-known phytochemicals, and the colors they produce.

Anthocyanins – From Yellow/Orange to Blue or Even Red

Anthocyanins are a group of approximately 400 pigment molecules found in flowers, fruits, and vegetables. The color shown depends on the pH the plant is exposed to. In most cases, an anthocyanin provides a purple or blue color, but occasionally, you will see red cannabis because of this pigment molecule. Anthocyanins don’t alter the smell or taste of your weed.
You can increase the production of anthocyanins by altering the light spectrum in LED lighting. As these molecules act as the plant’s sunscreen, increasing the light intensity will cause stress, thus boosting anthocyanins. The problem here is that if you overdo it, you give your plants the equivalent of skin cancer and damage them irreparably.

Chlorophyll – Green

Chlorophyll represents approximately 70% of the pigments contained in plants. It is the reason why the marijuana plant is predominantly green. It is essential for all plant life because it enables them to absorb enough light to perform the process of photosynthesis (where plants synthesize organic matter from inorganic matter using energy from light). As chlorophyll normally masks other pigments, most plants have a green hue.

Carotenoids – Orange, Yellow, and Red

Carotenoids are present in a variety of living organisms including plants. They play a crucial role in humans because they are involved in vitamin A production. As you probably know, vitamin A is related to growth and vision in humans. All green plants synthesize carotenoids, but these tend to be masked by the high chlorophyll content.
During fall, carotenoids are sometimes able to showcase their stunning array of colors as the chlorophyll content of plants dwindles. Lycopene is one of the most abundant carotenoids in plants and is responsible for red hues.

Flavonoids – Numerous Colors Including White and Cream

Flavonoids are one of the main reasons why flowers have several colors. There are flavonoids in all aerial parts of plants, and they play a crucial role in photosynthesis because they block harmful UV rays. Anthoxanthins are among the most prominent flavonoids in plants. These water-soluble pigments range in color from cream to yellow.

Other Reasons for the Colors of Cannabis

Growth Stage & Temperature

During the initial growth stage, you’ll probably notice that marijuana plants showcase an intense green coloring. You will usually need to wait until the flowering stage to see more colors, a sure sign that photoperiod is important in a plant’s coloring. Once you reduce the amount of light exposure to force the marijuana plant into flowering, you may see a color change in the leaves of certain species.
This process is known as senescence, and it becomes more intense as the flowering stage proceeds. Eventually, the biological maturation of the plant causes the production of chlorophyll to slow down and even stop. At this stage, the plant uses its resources to help ripen the flowers, which causes some leaves to wither and die.
Temperature also plays a major role in the color of cannabis. If you expose your plants to cold temperatures for a prolonged period, you will inhibit chlorophyll production. Remember, chlorophyll tends to mask other colors, so when you reduce its presence you allow secondary pigments such as anthocyanins to come to the fore.
This is one of the reasons why some marijuana plants become dark blue or purple near harvest. If the concentration of anthocyanins is low in cold temperatures, carotenoids are likely to appear, and the result is an array of gorgeous orange/yellow shades.

pH & Nutrients

The color of cannabis is also dictated by the pH and level of nutrients in the plant’s growing medium. If you are using a hydroponics system, keep the pH between 5.5 and 6.5. If you are using soil, the best range is 6.0 – 6.8. If the pH level remains close to 7.0 (neutral), your plants may show purple colors.
If the pH level goes below 5.5, a reddish color is more likely, and if the pH goes above 7.0, blue colors could become prominent in your weed. As for nutrients, if you want red weed, reduce the amount of phosphorus your plants receive. Make sure you don’t go too far and cause a phosphorus deficiency, though! You could reduce a plant’s nitrogen intake to ensure the leaves of your plants turn yellow. To be honest, we don’t recommend nutrient deficiency as a strategy to generate color.


A marijuana plant’s genome (its set of genes and chromosomes) determines its unique traits. The genome is transmitted via DNA and comes from a plant’s parents. As there are several thousand potential combinations, there are hundreds of genetic traits to consider. As a result, some strains develop and show secondary pigments, while other strains are never likely to showcase marijuana’s incredible range of colors.
In strains with blue and purple genetics, for example, the plant produces a higher than average amount of anthocyanins. Even so, there is no guarantee that the strain will provide a purple hue because of the pH, nutrient and environmental factors outlined above. Incidentally, strains with ‘orange’ in their name usually relate to the color of the plant’s hairs, while ‘white’ strains relate to the plant’s trichome production.

Final Thoughts on the Colors of Cannabis

In general, the only reason to choose colorful cannabis is because you like the look of it. It is a mistake to associate color with potency because the real reason why your purple weed is stronger than red cannabis is due to the strain’s cannabinoid content. 

Therefore, if you decide to pay extra for the most colorful marijuana strain you can find, you are only doing so for the aesthetic properties of the plant. Weed with a large number of anthocyanins may possess a greater amount of healthy antioxidants, but this notion is mainly based on a small sample of studies.