marijuana purple stem (2023)

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Causes of Purple Stems in Cannabis

What does purple stem mean? Purple stems may indicate that your plant will grow slowly, with buds forming slowly and smaller and less developed. Purple stems, stems, and petioles may indicateNutrients in Cannabis, root zone pH, plant health or environmental issues in the grow room.


When marijuana purple stem is caused by genetics, the plant will function normally and appear healthy. In other words, if the plant isn't showing any other signs of distress, the pigmentation may be part of its genetic makeup. There are many cannabis genetics available, and many of these varieties can develop purple or red pigmentation.


After extreme temperature changes,purple stem yellow leavesmay appear. Cannabis plants grown outdoors in daytime temperatures (80°F) and nighttime temperatures (50°F) may develop red or purple stems due to sudden temperature changes. Let's say an indoor gardener notices purple stem cannabis due to temperature changes. In this case, they may need to control the temperature of the dark cycle to not be 10-15 degrees cooler than the light cycle. Temperature fluctuations in indoor gardens can eventually lead to more serious humidity problems.


Fungi like Fusarium and Botrytis can change the color of plant stems and leaves. Fusarium attacks the stems of young plants, eventually causing them to fall or "wet." Sometimes it causes the stems to appear dark brown, red, or lavender. in turn,BotrytisAffects larger plants, causing them to die from robbing nutrients.FusariumBotrytis can spread from plant to plant and should be treated as soon as possible.

light intensity

Another reason for the purple stems of cannabis is the intensity of the light. When bright light hits your plants directly, their stems may turn purple. If insufficient light intensity is the cause, the lower stems of the plant will usually appear greener. Coloration in bright light is a natural plant defense mechanism that protects plants from UV damage.

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Indoor gardeners who use LEDs or lighting systems with high UV output are more likely to experience this.

find the perfectCannabis photoperiodmake sure there is no lighting


Cannabis plants respond to stress in several ways. Discolored stems may indicatetransplant shock, heat stress, overwatering or pest infestation. So, if you notice purple stems, it's important to pinpoint the source of the discoloration. Here is a list of potential stressors that can cause red stalks in cannabis:

  • temperature or humidity issues: If you feel that the temperature or humidity level in your grow room is not right, this may cause the stems of your cannabis plants to turn purple. If you suspect temperature and humidity are stressing your plants, make the necessary adjustments.
  • marijuana pests: Certain cannabis varieties are more susceptible to pests and plagues than others. If your plants have discolored stems, damaged leaves, stunted growth, and signs of mold, small insects, or spiders, you must act quickly.
  • light pressure or heat pressure: Leaving grow lights close to plants can also cause red stems. No matter what the weather is like! Some strains are more susceptible to stress than others, but almost all plants have a maximum light level. Even with low temperatures, plants can be stressed by light levels in the same way that a skier gets sunburned in the cold. Because too much light can cause stems to turn red and other symptoms of stress, it's best to keep grow lights within the manufacturer's recommended distance. Especially LED plant growth lights, because of thephotoburn in plantsIf you get too close.

Nutrient deficiency

Nutrient deficiencies can cause a variety of symptoms, including yellowing or drying new and old leaves and purple stems on fan leaves. Red and purple stems, followed by brown, dry leaves, are early signs of phosphorus deficiency. Conversely, a magnesium deficiency can cause red stems to appear on the fan leaves. Remember, these nutrient deficiencies don't just cause stem discoloration; they also causegrowth retardation, damaged foliage, and other symptoms.

use our guidemarijuana deficiencyIdentify the type of defect affecting the plant and correct it as soon as possible.


Getting the pH of your soil and nutrient solutions just right for healthy plants is critical. Unfortunately, this is also a problem for most growers. Cannabis likes slightly acidic soil (we recommend keeping it at 6.5 for best results). If your soil is too acidic or alkaline, your plants may lose healthy foliage and develop nutrient deficiencies as they struggle to absorb nutrients from your fertilizer. If your plants have red or purple stems or other signs of nutritional problems, check your pH. We recommend purchasing a pH and conductivity tester to get a good idea of ​​your soil's pH. These devices provide accurate readings of soil pH and nutrient conductivity, giving you an idea of ​​how well your plants are absorbing fertilizer.

Cannabis red stalk solutions

  1. once you are surepH problemresults in purple stems, which is what you should do. First, start preparing your nutrient solution. Check the pH of the nutrient solution with pH drops or a digital pH pen; it should be between 6.0-7.0 when growing in soil and 5.5-6.5 when growing in hydro and coir. When the pH is very high or too low, modify it with any pH Up or pH Down and verify it again until it is in the desired range. If you still have problems, the problem is with the substrate, so rinse for a few days and then feed constantly, usually with a pH nutrient solution.
  2. if you haveNutritional deficiency(phosphorus and magnesium), use slow-release nutrients or grow in super soil that has all the nutrients your plants need from seed to harvest. Make sure to fertilize your plants right away, or look for fertilizers that contain phosphorus and magnesium to avoid this.
  3. light intensity– if your plant is showingred stemNot exactly healthy though, dim the lights or change the height and keep an eye on their development. If the problem persists, keep changing the height of the lights until the plants are thriving.

Purple cannabis stems are not a major cause for concern. If your plants start to develop discolored stems, keep an eye on them and look for other signs that the discoloration is not caused by genetics or light.

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Ed Rashford

Ed Rushford's influence on cannabis cultivation is undeniable. Although he tends to focus primarily on 2 areas, plant training techniques and dealing with diseases, pests and other issues, he offers many insights into how cannabis plants survive and grow. That's not to say that Ed isn't familiar with the complete life cycle of cannabis from seed to harvest, but he uses his extensive knowledge to hone the ins and outs and niche areas of cannabis cultivation. Ed's goal is to spread the knowledge so everyone can be a better grower.about this author

Ed Rashford

Ed Rushford's influence on cannabis cultivation is undeniable. Although he tends to focus primarily on 2 areas, plant training techniques and dealing with diseases, pests and other issues, he offers many insights into how cannabis plants survive and grow. That's not to say that Ed isn't familiar with the complete life cycle of cannabis from seed to harvest, but he uses his extensive knowledge to hone the ins and outs and niche areas of cannabis cultivation. Ed's goal is to spread the knowledge so everyone can be a better grower.about this author

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Marijuana purple stem? ›

Finding red or purple stems on your cannabis plants might freak you out, but it's not necessarily a cause for concern. Keep reading for an overview of the potential causes of red or purple cannabis stems. Red or purple stems in cannabis can be a sign of stress, nutrient deficiency, pathogens, or simply genetics.

What does it mean when stems are purple? ›

While purple coloration on stems and petioles can be one of the signs of magnesium deficiency in plants, it is also a sign that the plant is producing natural purple pigments (anthocyanin) in response to ultraviolet (UV) light.

What does purple mean on marijuana? ›

Purple cannabis is simply a cannabis plant with a purple coloration or shades of purple hue. The coloration is often a result of the effects of water-soluble compounds called anthocyanins. Typically, you can associate these wine-colored flowers with indicas.

Are purple stems dominant? ›

purple stem color (P) is dominant to the allele for green stem color (p). Students in a biology class cross-pollinated a heterozygous purple-stemmed plant (Pp) with a green-stemmed plant (pp). The 78 seeds produced from this cross were planted to form the F1 generation.

Why did my plant turn purple? ›

Anthocyanins are protective compounds that shade and protect plants from excessive light, and their production and hence purple coloration increase with light. In addition to increasing pigmentation, they also make plants more resilient to some insect and disease pests and can improve stress tolerance.

Does purple always mean indica? ›

Indicas tend to be dark in color -- most purple varieties are indica-dominant -- and generally have earthy, musky, and incense-like aromas.

Why are my trichomes purple? ›

However, if we allow the flowers/buds to maintain their acidic pH early in the hang-dry process or right at harvest, the anthocyanins stay mobile and soluble and are extracted with the trichomes, essentially “dyeing' the oil purple as it is forced away from the flower.

How do you treat purple stems? ›

Magnesium deficiency can cause purple stems. A good cannabis-friendly nutrient system has a significant amount of magnesium, but if you're using very soft water, or RO water, you may need to add a Cal-Mag to your nutrient regimen.

What deficiency makes plants purple? ›

When you notice a plant with purple leaves rather than the normal green color, it is most likely due to a phosphorus deficiency. All plants need phosphorus (P) in order to create energy, sugars, and nucleic acids. Young plants are more likely to display signs of phosphorus deficiency than older plants.

Why are my seedling stems turning purple? ›

Cause: Phosphorus is an essential nutrient for root development and when it is in short supply, the seedlings' growth stops and the veins in leaves can look like they are tinted purple or red. Solution: Begin fertilizing with a phosphorus-rich nutrient formula after the leaves appear.

What plant has a purple stem? ›

Pokeweed is an erect herbaceous perennial shrub, 4 to 10 feet tall and 3 to 5 feet wide, with large leaves and showy purple-black berries. It has a smooth, stout, purplish stem that branches extensively and can reach up to 2 inches in diameter.


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