Growing Purple Weed Buds | Vancouver Seed Bank

Growing Purple Weed Buds

how to grow purple weed

Growing purple weed is an exciting project for cannabis growers who want to add some flare and visual appeal to their harvest. Although a strain’s genetics mostly dictate whether or not it will turn purple, cultivators can use certain methods to help their cannabis plants become brightly colored. In this guide, we’ll explore various methods on how to make weed purple and achieve stunning results in your cannabis garden.

Table Of Contents

About Purple Weed

What Makes A Weed Strain Purple?

Factors Influencing Purple Coloration

Which Parts of Cannabis Can Turn Purple?

A Guide on How to Grow Purple Weed – Tips and Techniques

Is Purple Weed Better Than Green Weed?


Frequently Asked Questions

About Purple Weed

Purple buds in cannabis have captivated growers and enthusiasts alike for their stunning visual appeal and unique flavor profiles. The mesmerizing hues of violet, lavender, and deep purple add an extra layer of allure to the cultivation process. In this guide, we delve into the science behind purple cannabis buds and explore techniques to maximize their vibrancy.

Anthocyanins are a class of pigments that give plants their red, purple, and blue colors. They are mainly responsible for the purple coloration seen in cannabis buds. Environmental elements that affect anthocyanins include variations in temperature, exposure to light, and the availability of nutrients. Higher anthocyanin content in some cannabis strains makes them more likely to produce purple buds under the right circumstances.

What Makes A Weed Strain Purple?

Purple weed is caused by the presence of anthocyanins, pigments found in cannabis plants. These compounds produce red, purple, or blue hues under specific environmental conditions. Factors such as cooler temperatures during the flowering stage, genetics of the strain, exposure to certain light spectrums, and nutrient levels influence anthocyanin expression. 

Buds that are vivid purple are produced by the development of anthocyanins, which is triggered by cooler temperatures, usually in the late flowering phase. Genetics is important since some strains are genetically prone to becoming purple in color. Purple coloration in cannabis buds can be enhanced through strain selection and environmental manipulation.

Factors Influencing Purple Coloration

  • Temperature: Regulate environmental conditions to induce cooler temperatures during the flowering stage. Cooler temperatures during the flowering stage can trigger the expression of anthocyanins, leading to purple pigmentation in cannabis buds. Nighttime temperatures between 50-70°F (10-21°C) can encourage the development of vibrant purple hues.
how to grow purple weed
  • Genetics: Some cannabis strains are genetically predisposed to produce purple buds. Varieties such as Purple Kush, Granddaddy Purple, and Purple Haze are renowned for their striking purple coloration.
how to grow purple weed
  • Light Exposure: Adjust lighting schedules and spectral composition to optimize purple pigmentation. Yet, excessive light stress can inhibit anthocyanin production and compromise bud quality.
how to grow purple weed
  • Nutrient Deficiency: Some nutritional shortages, especially those involving potassium and phosphorus, can make cannabis plants more purple. To avoid negative impacts on plant health and yield, it is imperative to maintain balanced nutrient levels.
how to grow purple weed

Which Parts of Cannabis Can Turn Purple?


The most striking display of purple in cannabis occurs in the flowers, also known as buds. Anthocyanins can manifest in the petals and calyxes, creating vibrant shades of purple, ranging from deep indigo to soft lavender.


While less common than purple flowers, cannabis leaves can also exhibit purple pigmentation. The undersides of leaves are more prone to turning purple, especially in response to cooler temperatures during the flowering stage.


In some cannabis varieties, the stems may develop purple hues, particularly in regions exposed to cooler temperatures. Purple stems add visual interest to the overall appearance of the plant.

Veins and Petioles

Veins and petioles, the small stalks that connect leaves to stems, may also showcase purple coloring. This phenomenon is less common but can contribute to the plant’s overall aesthetic appeal.

A Guide on How to Grow Purple Weed – Tips and Techniques 

We’ll explore the steps and techniques you can employ to maximize the chances of growing purple weed successfully.

Selecting the Right Genetics

Start by choosing cannabis strains known for their purple hues. Varieties like Purple Kush, Granddaddy Purple, and Purple Haze are popular choices for growers seeking vibrant purple buds. Look for strains with genetics predisposed to producing anthocyanins, the pigments responsible for purple, blue, and red colors in plants.

Optimizing Temperature Fluctuations

Temperature fluctuations during the flowering stage can trigger anthocyanin production and enhance purple coloration in cannabis buds. During the final weeks of flowering, expose your plants to cooler nighttime temperatures while maintaining slightly warmer daytime temperatures. Aim for a nighttime temperature drop of around 10-15°F (5-8°C) compared to daytime temperatures.

Adjusting Nutrient Levels

Carefully manage nutrient levels to encourage the development of purple pigments in your cannabis plants. While nutrient deficiencies or imbalances can hinder coloration, slight nutrient stresses can stimulate anthocyanin production. Consider reducing nitrogen levels and increasing phosphorus and potassium during the flowering stage to support healthy bud development and enhance color expression.

Providing Adequate Light

Proper lighting is crucial for maximizing the potential for purple coloration in cannabis buds. Ensure your plants receive sufficient light intensity and spectrum throughout the flowering phase. Some growers experiment with using LED grow lights that emit specific wavelengths, such as blue and red light, to enhance anthocyanin production and promote purple pigmentation.

Managing Environmental Stress

Subjecting cannabis plants to mild stressors can induce the production of anthocyanins and intensify purple coloration in the buds. Techniques such as defoliation, low-stress training (LST), and selective pruning can stimulate stress responses and enhance color expression. However, it’s essential to avoid excessive stress, as it can compromise plant health and yield.

Harvesting at the Right Time

Monitor your plants closely as they approach maturity, and harvest them at the optimal time to preserve the vibrant purple coloration of the buds. Wait until the trichomes have reached the desired level of ripeness, typically when they have turned cloudy or amber in color. Harvesting too early or too late can diminish the intensity of the purple hues.

Is Purple Weed Better Than Green Weed?

Both green weed and purple weed offer unique characteristics and experiences for cannabis enthusiasts. Green weed is the most common variety of cannabis and is characterized by its vibrant green coloration. On the other hand, purple buds result from anthocyanins, pigments activated by cooler temperatures. These compounds not only create striking aesthetics but may also offer antioxidant benefits. 

Some strains naturally produce purple hues, while others require specific temperature manipulation during the flowering stage to induce color change. Understanding the factors influencing bud coloration can enhance cultivation techniques and lead to visually stunning and potentially more potent cannabis varieties.


Purple cannabis buds require careful attention to detail, genetic selection, and manipulation of the environment. It is an artistic undertaking. Growers can experience the full range of colors in their cannabis plants by learning what influences purple coloration and using focused strategies. The attraction of purple buds adds a bit of mystery to the world of cannabis production, increasing the experience for both enthusiasts and connoisseurs, whether for personal enjoyment or commercial growth. Experimentation and observation are key as you refine your approach to cultivating cannabis with vibrant purple coloration.

Frequently Asked Questions 

1. How to turn weed purple?

Weed turns purple due to the presence of anthocyanin pigments, which are naturally occurring compounds found in certain cannabis strains. Cooler temperatures during the flowering stage can induce the activation of these pigments, resulting in purple hues.

2. Can I grow purple weed indoors?

Yes, it is possible to grow purple weeds indoors by selecting strains known for their purple coloration and manipulating temperature and lighting conditions during the flowering stage. However, indoor growers should ensure proper environmental control to achieve the desired results.

3. Can any strain of weed be purple?

Not every strain of weed can naturally produce purple buds. The genetic makeup of the strain largely determines its potential to develop purple hues. Varieties with genetics predisposed to producing anthocyanins, such as Purple Kush or Granddaddy Purple, are more likely to yield purple-colored buds.

4. How can I encourage my weed plants to turn purple?

To enhance the likelihood of producing purple weed, select strains known for their purple hues and expose them to cooler nighttime temperatures during the final weeks of flowering. Additionally, consider managing nutrient levels, providing adequate light, and subjecting plants to mild environmental stressors.

5. Can purple weed be less potent or flavorful than green weed?

The color of weed, whether purple or green, doesn’t necessarily correlate with potency or flavor. The overall quality and characteristics of the buds depend on factors like genetics, growing conditions, and post-harvest processing. Purple weed can be just as potent and flavorful as its green counterparts.


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