How to Grow Pink or Purple Cannabis Buds
Table of Contents
Would you like to grow colorful cannabis buds? You may have seen marijuana buds that are pink, purple, red, orange, or possibly even blue! But how do you grow colorful buds at home?
If you want to grow buds that are pink, red, or purple, you must choose the right genetics!
The tendency to turn colors is almost 100% determined by strain/genetics, so you can’t force any plant to produce colorful buds. However, you can purchase seeds of strains that naturally turn vibrant colors, and there are tricks to maximize their genetics and bring out the colors of your buds.
You cannot produce buds this purple without a strain that has been bred to makes purple buds. There are tricks to maximize the natural color of your genetics, but you have to start with good genes!
4 Different “Parts” of Cannabis Can Become Colorful
When people are talking about “colorful” buds, most people imagine brightly colored buds in their hands. But there are actually different parts of cannabis plants that can display non-green colors, and sometimes people will lump all them all together. Each one is a little different from each other, and some have a significant effect on the final looks of your bud, while others don’t make much difference.
Many different parts of a cannabis plant can turn purple, including the whole plant!
The parts of the plant that can become colorful are…
- Pistils (Hairs) – some of the color remains after drying/curing
- Calyxes (Buds Themselves) – very strong effect on final color
- Leaves – relatively small effect on final bud color since many are removed by trimming
- Trichomes – small effect on final color
Buds are made up of different parts and are usually more than one color
Colorful Pistils / Hairs
Most growers want the buds themselves to appear colorful, so the color stays even after the buds are dried and cured.
There are two parts of the buds that can turn color. One part is the pistils/hairs that stick out. There are several strains where the pistils turn pink or purple.
Sometimes just the pistils/hairs turn pink or purple, while the leaves and buds may still be green.
When buds are dried, they retain some of their pistil color, but you will still be able to see the color coming through underneath.
Colorful Calyxes (Buds Themselves)
Calyxes are what make the buds themselves. Cannabis “buds” are actually made of hundreds of calyxes stacked on top of each other, and some or all of them may become colors other than green.
This fantastic picture shows how the overall appearance of buds changes with the ratio of colorful vs. green calyxes.
Nearly all Smooth Smoke buds (by Tropical Seeds) produce at least a few pink calyxes here and there, and some plants in the right conditions can produce buds where almost every calyx is a deep purple.
Calyxes are what give the most color to your buds. Even a few purple calyxes can give the buds an overall purple tint, and when you break open the buds there will be some pieces that are completely purple.
This nug contains several purple calyxes.
After being ground up, you can see the purple pieces distributed throughout. The higher the percentage of purple calyxes, the more vibrant your final bud color will be.
Colorful Leaves – Sometimes It’s Not the Buds That Turn Color!
With some strains, the leaves may turn purple while the buds stay mostly green. This can make for absolutely gorgeous plants, but since leaves mostly get trimmed off after harvest, usually, a lot of the purple will no longer be visible on the buds after the trimming process.
For some strains, the leaves may turn purple while the buds stay green. This often happens after the plant gets exposed to chilly night temperatures (but not always). The leaves exposed to direct light are most likely to turn purple, while leaves in the shade often stay green.
Although the leaves have turned purple, the buds themselves are mostly green.
Only the tops of buds exposed to direct light have any purple left after trimming off all the leaves. Trimming removed almost all of the purple coloring.
In general, cannabis trichomes go from clear (not ready) to white (highest THC) to amber/yellow (more of a mellow effect) before they eventually wither and die. These color changes are often used to determine the best time to harvest cannabis.
However, sometimes, trichomes can turn purple or pink, making it difficult to know when to harvest. In that case, you want to also look at the pistils to determine the best harvest time!
Purple or pink trichomes can make it tough to know when to harvest, but they’re exotic and beautiful! The color of trichomes may leave a slight tint on the buds after they’ve been dried and cured, but the bud color underneath will be the dominant color.
Now on to making purple buds at home!
How to Maximize Color and Genetics
Before you do anything else, you need to begin with the right genetics. If the genes of your plant don’t make colorful buds, there’s nothing you can do! So, you must start with a colorful strain to get the best results with maximizing color.
- Choose Colorful Strain (Most important!)
- Choose Strain that Produces Very Dark Colors (if you want buds to maintain color after being harvested and dried)
- Temperature – Warm days & cool nights
- Bright Light – Strong light levels can help bring out color
- PH at the Roots – Some strains may express colors at higher or lower pH ranges
Choose Strains with Brightly Colored Buds and Pistils If Possible – This maximizes the overall colorful appearance of your buds.
For the most significant final effect on your dried and cured buds, you want to choose a strain where as many parts of the plant as possible are colorful. So ideally, you want buds where the pistils and calyxes (which make up most of the final color) are both vividly colored. If the leaves and trichomes are also colorful, that will improve the effect even further.
In this case, the buds are purple, but the pistils are orange.
To maximize the final color, you want to choose a strain with brightly colored buds and pistils. For example, this bud has purple calyxes, mostly purple pistils and even some purple leaves. This combination makes the entire bud appear bright purple.
Choose Deep Purple Buds for Maximum Color After Drying/Curing – Deeply colored buds (sometimes called “black” strains) tend to be the most vibrant after drying/curing.
To produce the most colorful buds, you need to make sure the color goes all the way through the buds, and ideally, also through all the surrounding leaves. This level of color-penetration is most likely to happen with intensely dark colored buds. Buds that are paler in color tend to lose a lot of their vibrancy in the post-harvest processing.
These buds were mostly pink at harvest, but the color doesn’t go all the way through the buds.
There was still a lot of green on the parts of the buds that didn’t get direct light.
After they’re trimmed and dried, the pink color has become more subtle.
You will “keep” the most color after drying/curing by choosing strains that are dark purple through and through, from buds to pistils to leaves if at all possible. Deeply colored buds keep more of their color after drying and curing than pale purple or pink buds.
These buds were deep purple at harvest…
When buds are darkly colored, they tend to keep more color after being dried and trimmed.
Note: Your buds will naturally lose some of their overall vibrancy and color during the drying/curing process (but not any of their potency!). That’s why you will likely never run into neon purple buds that have already been dried and cured for 2+ weeks. Even green buds go from being bright green to a more muted green color by the time they’ve cured for a few weeks. When you see very brightly colored buds, it almost always means the buds are still relatively fresh.
Although color is determined primarily by genetics, there are a few things you can do to help your plant express its natural colors…
Temperature – Some Strains Express Colors When the Night Temperature is a Few Degrees Cooler than the Day
If you’re growing a strain that turns color, some strains will only show their colors when night temperatures are at least a few degrees cooler than during the day in the flowering stage, especially towards the end. However, some plants don’t react to cool night temperatures, and many strains (like Panama) nearly always turn color no matter what the temperature.
Certain strains like Querkle turn color more easily when the temperature is warm during the day as opposed to cool at night. So, it’s always a good idea to aim for nice warm days, and cool, comfortable nights, because that contrast seems to help bring out colors for many strains.
How to Maximize Color with Temperature
- Warm Days (75-80°F / 24-27°C)
- Cool Comfortable Nights (65-70°F / 18-21°C)
Note: Some strains turn color no matter what the temperature. You can sometimes contact the breeder and ask if they have advice on how to bring out colors for a particular strain. I’ve found that most breeders will get back to you quickly if you go to their website and ask questions!
Temperature makes a difference! Some strains need contrast between day/night temperatures for their buds to turn colors. For example, the buds of this Auto Frisian Dew turned bright purple after it started getting below 70°F (21°C) temperatures at night.
Strong, Direct Light may help bring out colors
In some cases, a plant may produce purple tones in response to intense, direct light (on buds and leaves). Although we’re not sure exactly why it’s possible this may act as a sort of sunscreen for the plant! The importance of light levels varies on a strain by strain basis.
The pH at the Roots may affect cannabis bud color expression
Outside the cannabis world, there are a few species of plants with flowers that are known to turn different colors based on the pH at the roots.
For example, the flowers of specific types of hydrangeas can turn blue in very acidic soil but may turn pink if exposed to neutral or only slightly acidic soil (though this type of variation is rare in the plant world).
Yet there have been occasional reports of cannabis strains that produce different bud colors based on the pH at the roots, though unfortunately, more testing is needed!
If growing multiple plants of the same strain, you might consider giving plants different pH ranges to see what effect it has on the final bud color!
Pictures and Examples of Colorful Strains
Here are some pictures of cannabis strains that sometimes grow colorful purple and pink buds.
Photoperiod (Regular) Strains
The next two pics are of the strain Frisian Dew, a popular strain by Dutch Passion, who specifically designed the strain for growing outdoors. It is exceptionally hardy, high yielding, and is also mold and pest resistant. About 50% of the time, Frisian Dew buds will turn bright purple instead of green!
The plant in the middle with the dark purple buds is Frisian Dew.
Purple Trainwreck buds are usually purple-tinted, with purple leaves or pistils.
This Purple Trainwreck plant is growing purple pistils.
For this Purple Trainwreck cola, it’s mostly just the leaves turning purple. In either case, the effects are the same!
This Purple Trainwreck bud turned particularly purple.
The following plants with pink pistils are from the strain Panama by Ace Seeds
This is what Panama buds may look like when they’re first growing in.
beautiful pink pistil pic by trippergreenfeet
As the Panama buds develop, the pistils and even the buds themselves may intensify their pink color
Smooth Smoke buds (by Tropical Seeds) can become quite colorful, with colors from hints of pink to deep purple!
Auto Frisian Dew
Auto Frisian Dew by Dutch Passion (this is an auto-flowering version of the original famous marijuana strain) – Unlike the regular Frisian Dew which gets about 50% purple bud plants, the breeder claims only 10% of the plants from this strain produce purple buds. Still, some growers are getting far better odds than that. When purple does appear, the color is incredibly vibrant and spills out onto the nearby leaves!
This Auto Frisian Dew plant got a little stunted at first, but still ended up producing beautiful purple buds!
Auto-Flowering Bloody Skunk
Auto-Flowering Dark Devil
Dark Devil Auto is another fabulous auto-flowering strain by Sweet Seeds that turns a gorgeous purple or even a deep red.
This Dark Devil Auto bud turned completely purple from top to bottom.
Purple Kush Auto
Brilliant color on Purple Kush Auto plants! The buds turn almost black after being dried!
pics by kingkola1
Colorful “Duck” Strains (Stealth Leaves)
“Duck” strains are characterized by their oddly shaped leaves. The idea is that the plants look less like cannabis with 3-finger leaves. The bright colored buds also help make them look less like cannabis.
One of the most popular variations of the Ducksfoot (Ducksfeet?) strains is called Frisian Duck by Dutch Passion. This strain thrives outdoors and grows with the traditional stealthy leaves. This strain also often makes bright, beautiful purple buds (with cold enough temperatures) that have a fresh scent that is sometimes even a little fruity.
Frisian Duck plants react well to growing in a living soil that’s been composted and amended with slow-release organic ingredients.
This is a Frisian Duck plant in the vegetative stage.
This Frisian Duck plant was grown outdoors in a greenhouse. More than half of Frisian Duck plants grow bright purple buds!
Frisian Duck is based on the famous Frisian Dew strain which also produces purple buds and has been bred for generations specifically for growing outdoors. The Frisian genes thrive under sunlight, and buds are resistant to bugs and mold!
This Frisian Duck plant is just about ready to harvest!
However, even with stealthy strains, be aware that they still smell like cannabis in the budding stage!
Why Do Cannabis Leaves and Buds Turn Purple?
Sometimes you’ll see purple leaves because of a nutrient deficiency, but oftentimes purple leaves are actually caused by natural plant processes!
There are many species of plants that make purple leaves. The leaves appear purple due to high levels of a purple pigment called anthocyanin. Anthocyanin may act as a sunscreen for plant leaves because it protects against damage caused by UV-B rays. Anthocyanin is also known to help protect against cold or heat stress on the cellular level.
It’s not just cannabis plants that grow purple leaves. Here’s an example of a False Shamrock plant, which has glorious purple leaves from top to bottom!
With some cannabis strains, the leaves may turn purple while the buds stay green. Just like with buds, the leaves are more likely to turn color when the plants are getting cool night temperatures in the late flowering stage.
The leaves most likely to be affected are the top leaves and other leaves getting direct light. With this purpling, the leaves in the shade of the plant usually stay green.
For some strains, the leaves may turn purple while the buds stay green.
The leaves of this plant turned purple overnight after that plant was exposed to chilly night temperatures.
The leaves exposed to direct light are most likely to turn purple, while leaves in the shade often stay green
In this case, all the leaves that are exposed to the light have turned purple, including the sugar leaves. However, once the leaves are trimmed off, the buds will be mostly green.
Buds may still be purple-tinted from leaves that weren’t completely trimmed off.
If there’s a lot of purple leaves, there may be a lot of color left even after trimming.
Case Study – Super Purple Haze plant
The top leaves of this Super Purple Haze plant have turned a vibrant purple
Here are the buds from that Super Purple Haze plant drying – you can see that the parts of the buds that were exposed to the light have strong hints of purple
A closer look at those buds so you can better see how much bud is purple and how much is green after being trimmed and dried (click for a closeup!)
This cannabis plant has grown vibrant red and purple leaves.
This outdoor cannabis plant has turned purple everywhere it received direct sunlight. Splendid!
Cannabis sometimes has neat mutations, like this two-tone plant where only half the leaves turned purple!
These Swiss Cheese plants by Nirvana exploded with red, pink and purple leaves when it got cool at night right near harvest time, but the buds themselves did not change color. Unfortunately, when just the leaves turn color, the buds themselves will often look mostly green once they’re trimmed. But this beautiful picture lives forever!
Bright purple stems may be a sign of a phosphorus deficiency, but this “symptom” is sometimes actually caused by genetics, just like purple leaves, pistils or buds!
Blue Dream (rare deep purple phenotype)
Blue Dream buds usually don’t turn this deep purple, so if you want to see buds like this you’re better off with a strain that’s bred to always grow dark purple buds. However, the pictures were so beautiful I just had to share!
How can you grow colorful buds that turn purple or pink? Learn which strains to get, as well as what you can do to maximize color during your grow.
What causes red stems in cannabis plants?
You’re checking on your plants, things have been going pretty well. Then one day you notice a plant has bright red stems. Maybe there are other symptoms, too, like burnt leaf edges/tips, clawing/curling leaves, or yellowing.
A common cannabis plant symptom is red stems. What does it mean?
You love your plants, so what do you do? What’s causing your plant’s stems to turn red or purple?
There are a few different causes of red stems so I’ll share the most common ones below. Once you go through this list, you’ll be armed with more information to help keep your plants healthy and happy. Get the great yields and amazing bud quality you’re looking for.
Here are 6 common causes of red stems in cannabis plants:
1.) A “Sun Tan”
If a stem is totally exposed to strong direct light, it will often turn red, pink, or purple over time. If this is the cause, you’ll likely notice that any parts of the stem that are in shade will stay green. This is a defense mechanism by the plant to protect the stems from too much light. This type of red coloring is especially common with grow lights the produce a lot of UV light such as LEC grow lights (bonus: those same UV rays increase trichome production!).
With the rise of plant training techniques that expose bare stems, such as manifolding or defoliation, red stems caused by direct light is more common than ever.
In this case, you probably have nothing to worry about as long as you aren’t seeing any other symptoms and plants are growing fast and healthy.
This video shows how the stems/petioles lower in the plant are the typical green color. However, if you look closely at the stems higher on the plants, the tops have turned red wherever they’re getting direct exposure to light. Light exposure can be a major contributor to red stems.
Some plants (especially strains that produce purple buds or leaves) will naturally grow colorful stems. These stems may be reddish but typically look closer to purple than bright red. The purple color appears on stems all over the plant as opposed to just places that are getting light. There’s nothing to worry about in this situation, so you can just enjoy the purple 🙂
3.) Temperature Fluctuations
Hot days and/or cold nights can trigger purple or reddish stems and leaves. If the discoloration appears the day after a cold night, the quick change in temperature may have caused the colorful stems. Typically temperature fluctuations cause stems to look purple, but sometimes the color can appear reddish.
These stems turned reddish-purple in response to cold night temperatures
4.) Plant Stress
Cannabis plants react to stress in unpredictable ways. It may seem odd, but sometimes discolored stems are caused by seemingly unrelated factors like overwatering, bugs, or heat. That’s why it’s important to pay close attention to plants, use good watering practices and maintain a great growing environment when cultivating cannabis.
Many different types of plant stress can cause red stems. This plant with red stems looks like it is suffering from a nutrient deficiency, but the real cause of the symptoms is a planthopper infestation.
If the temperature of your growing environment seems extreme to you, it may be stressing out your plants. Each strain is different, but cannabis plants generally grow best in temperatures that are considered comfortable or slightly warm to humans. You should be able to put a hand where your plants are under the light and hold it there comfortably for 30 seconds. If it feels too hot for your skin, it’s likely too much heat for your plants. Learn how to create a perfect plant environment.
Red stems can also be triggered by keeping a grow light too close to the plants. Regardless of the temperature! Some strains are more sensitive to light stress than others, but just about all plants have a limit when it comes to light levels. It may be surprising, but a plant can experience stress from the light intensity even if the temperature is cool, similar to how a snowboarder can still get sunburned in the cold.
Since too much light can cause red stems and other symptoms of stress, it’s always a good idea to keep your grow lights at the distance recommended by the grow light manufacturer. LED grow lights especially are infamous for light-burning plants if kept too close (it’s common for growers to keep moving them closer since they run cool).
Keep grow lights the recommended distance away to avoid symptoms from light stress
5.) Nutrient Deficiency Caused by Lack of Nutrients
If you look at your plant and you’re noticing that it’s pale all over, in addition to the red stems, that’s a sign your plant may simply need higher levels of nutrients overall. This is especially common if a plant has stayed in the same plant container for a long time without getting extra nutrients. If you’re growing in an inert soilless medium like coco, you may be giving too-low levels of nutrients. If you’re in a hard-sided pot, it’s also possible your plant is rootbound as opposed to out of nutrients, which means you should transplant to fresh soil. If you’ve been giving your plant nutrients in the water, this probably doesn’t apply to you, so skip to the next step.
The overall pale color alongside the red stems means this plant needs higher levels of nutrients overall. Grown in coco coir (which doesn’t naturally contain any nutrients), this grower needs to give higher levels of nutrients in the water.
Cannabis plants use high levels of nutrients compared to a lot of house plants, so growers typically add nutrients as part of the growing process. However, there are a few styles of growing cannabis that don’t require the use of extra nutrients at all.
For example, you can grow plants from seed to harvest in a big pot of richly amended, freshly composted (“alive”) soil that’s been formulated for a plant like cannabis. This technique works by providing nutrients via a method similar to nature. The composted soil contains a colony of microorganisms that break down organic material into nutrients, which your plant can use over the course of months. Known as a “just add water” grow method.
Where to get “just add water” soil? I recommend Nature’s Living Soil for a premade “Super Soil” concentrate. I’ve found them to be a great company that stands behind their product and they happily answer questions about how to use their concentrate for growing cannabis. Add it to regular soil or coco and the organic sources of nutrients slowly break down over months. If you follow instructions, you shouldn’t need to add nutrients in the water from seed to harvest.
These plants were started in nutrient-rich soil, but they used all the nutrients up before harvest. This caused the yellowing leaves and red stems.
If your plants have been growing in the same pot for a while, it’s possible all the nutrients in the soil have been used up (even if you started them off in richly amended super soil). Or perhaps the soil originally didn’t contain high enough amounts of phosphorus and magnesium, which can trigger red stems. In either case, if you suspect your plant is just low on nutrients, the best option is to supplement your plant with extra nutrients. Even if you’re growing organically, there are natural sources of nutrients that can be added to hold your plant over and make sure it’s getting complete nutrition until harvest. Make sure to use nutrients formulated for cannabis, because complete nutrition ensures the biggest, best and stickiest buds!
If you’ve been giving your plants good nutrients and ruled out all the above factors, your red stems are likely caused by a…
6.) Nutrient Deficiency Caused by the Wrong PH
Is your pH too high or low? If you’ve ruled out all the above triggers, there’s a strong chance the red stems are a sign your plant has a pH-based nutrient deficiency (or the beginning of one). Nutrient deficiencies that can affect red stems include Magnesium deficiencies and Phosphorus deficiencies. If you’ve been giving your plants nutrients, these deficiencies are typically caused by incorrect pH.
A nutrient deficiency is especially likely if your stems are bright red (not purple) all over the plant, and the coloring doesn’t seem affected by light exposure. You may also see other symptoms of deficiencies such as brown edges, curling leaves, burnt tips, yellowing, and more. Luckily, nutrient deficiencies caused by incorrect pH are easy to get rid of.
Red stems can be caused by nutrient deficiencies caused by too-high or too-low pH. This leaf is suffering from multiple problems including red stems.
Growers like to skip over testing the pH of water because it doesn’t seem glamorous, but I think of adjusting pH like a supplement that makes plants grow better. Plants grow faster and healthier when they get the right pH. Even when using “PH Perfect” nutrients or “Super soil” (which provide a buffer against pH-based nutrient deficiencies), it’s still possible to experience problems if the pH gets too out of whack. Don’t skip this step if you’re experiencing problems with your plants!
How to Test and Adjust the PH (full pH tutorial)
- Add all your nutrients and supplements to your water (if you’re using any)
- Test the pH of your water before giving it to your plants
- Option 1: Test pH with drops (included in most basic PH Test Kits) that change color and get compared to a color chart
- Option 2: Use a digital PH Pen which will give you a precise number reading (I love this PH Pen but there are cheaper options that get the job done)
- PH of water should be between…
- Soil: 6-7 pH
- Coco or Hydro: 5.5-6.5 pH
- If the pH is too high or low, adjust it to the proper range before giving the water to the plants (a PH test kit has liquids that adjust the pH of water)
- Water your plants with your freshly pH’ed water
- If you’re still experiencing nutrient problems, test the pH of the runoff water (collect a sample of the runoff water that comes out the bottom and test the pH of that too)
- If the runoff pH is too high or low (even though you put the water in at the right range) it means something in the grow medium is affecting the pH.
- The gentle way to fix this is to give your plant water from the opposite end of the pH range at every watering until the runoff starts coming out in the proper pH range. This will change the pH slowly over time.
- If there’s an extreme deficiency with lots of symptoms, you might want to actually “flush” the plant by running water through it until the pH comes out in the right range. This removes extra “stuff” that may have been affecting the pH, and basically gives you a blank slate. Flushing in this way is well suited to growing in coco, but isn’t a good choice in soil unless you’re replacing the lost nutrients by giving additional nutrients in the water. You don’t want to flush out all the nutrition without replacing it. Learn more about flushing sick plants.
How to adjust pH?
Luckily this is easy. Use a bottle of “PH Down” in order to bring the pH down, and “PH Up” to raise it. Both are included with a basic PH test kit.
These are strong liquid supplements that can be added directly to the water to adjust the pH. Use a small amount of liquid to start, just a 1/8 tsp or a few mL (PH Down is especially concentrated). There is also Natural PH Down and Natural PH Up which are suitable for use in organic setups.
A standard PH Test Kit has everything you need to test and adjust pH
What exactly is pH?
PH is a scale that measures how basic or acidic a water-based solution is. It’s typically shared as a number between 1-14. Pure room-temperature water is considered neutral and has a pH of
Why does pH matter to cannabis growers?
Managing the pH is the #1 way to prevent nutrient deficiencies. PH is important to cannabis growers because pH has a huge effect on nutrient absorption. Keeping your water at the right pH for the type of plant and growing medium allows your plant to absorb nutrients quickly and easily.
Cannabis plants typically grow faster and healthier at the recommended pH
How exactly does pH affect nutrient absorption?
A plant’s roots have the remarkable ability to absorb nutrients from the soil and use them inside the plant. This is accomplished with a complex series of processes, but just to keep things simple for the sake of explaining why pH matters, imagine there are “holes” in the roots that let nutrients in. Now imagine those holes are shaped like circles. When the pH at the roots is in the right range, the nutrients take on the form of circles, which easily pass through the holes into the plant. However, if the pH is too high or low, it actually changes the physical structure of the nutrient molecules. It turns the nutrient molecules into other shapes, for example squares. These squares have a much harder time passing through the round holes. Your plants won’t be able to absorb the nutrients (even though they’re physically “there”) and as a result your plant will experience nutrient deficiencies.
This tutorial covers every cause of red stems I’ve learned about since I started growing in 2008, but like every article on this website, we’re always adding and updating as we learn more. If you’re still experiencing red stems after going through the above steps, we want to hear from you! Don’t hesitate to contact us with pictures and info. Just say you read this article and we’ll take a look 🙂
What causes red stems in cannabis plants? You’re checking on your plants, things have been going pretty well. Then one day you notice a plant has bright red stems. Maybe there are other symptoms,