Why Is Some Weed Purple
                     Why Is Some Weed 
Purple?
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Purple weed strains are gorgeous, much-coveted variations of the cannabis 
plant. Many users claim that they’re stronger than the usual green stuff.
Purple weed strains are gorgeous, much-coveted variations of the 
cannabis plant. They look delicious, and many users claim that 
they’re stronger than the usual green stuff. Unfortunately, that 
one’s a myth. Purple and green buds are pretty much 
interchangeable. There are plenty of myths about how purple weed 
grows, too, so let’s get to the bottom of it: why is some weed 
purple?
Myths
Let’s get the myths out of the way first. People claim that you can turn 
your weed purple by the following methods:
Oxygen deprivation. Plants need oxygen to grow. A lack of oxygen will 
stunt the plant’s growth, not change its color.
Excess nitrogen. Plants also need nitrogen to grow, but more 
is not better. Excessive nitrogen will burn the plant, not change its color.
Altering the light cycle. Plants need a certain amount of light during the 
day to stay healthy – if you mess with that too much, your plants will 
become unhealthy. They will not change color. 
Changing the amount of water. In the wild, plants suck up a different 
amount of water every day. Cannabis is the same way. More or less 
water may harm the plant, but it won’t turn it purple.
Science
A batch of weed turning purple comes down to three things: genetics, 
temperature, and the soil’s pH balance. Growers who want a batch of purple 
cannabis need to pay attention to all three, but genetics is the most 
important. Without a genetic predisposition to turning purple, the strain 
won’t be able to do it – no matter how carefully the temperature and pH are 
controlled.
Purple-hued cannabis gets its color from the same source as blueberries: 
water-soluble pigments called anthocyanins. These anthocyanins are more 
prevalent in some strains than others, which is why some strains are more 
prone to “purpling.” When a strain predisposed to purpling switches to its 
winter cycle of flowering, it will change colors. This is because the cold 
breaks down chlorophyll, allowing the anthocyanins to overpower it. To 
some extent, the soil’s pH level will determine the color of the anthocyanins.
Growers can induce a “winter” cycle for a crop by gradually 
reducing the temperature of the plant’s environment during the 
dark cycle. However, this can stunt the crop’s growth if it is done 
too much or too quickly, and can reduce the amount of THC that 
will be present in the final dried bud. Fortunately, many famous
 purple strains have been bred with pigment in mind. Now, many 
of them turn purple more easily, without damage to the strain’s 
THC production. Thanks to this selective breeding, purple weed is 
just as dank as it looks!
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