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Botrytis, also called “bud rot” or “gray mold,” is a fungus that harms cannabis plants, especially during flowering. It’s a damaging, contagious disease that can hurt plant health and yield. This is what “botrytis” means in relation to cannabis.

Origins and Characteristics:

Botrytis cinerea is a necrotrophic fungus that has a wide host range and can affect various plant species, including cannabis. It thrives in cool, humid conditions, making it a common problem in regions with high humidity or during wet seasons.

Appearance and Symptoms:

When a cannabis plant is infected with botrytis, it displays specific symptoms that can vary depending on the severity of the infection. Common signs of botrytis include:

  1. Gray Mold: Botrytis-infected buds often develop a grayish-brown, fuzzy mold. Initially, the mold may appear as small spots or patches on the flowers, which then spread and cover larger areas.
  2. Bud Rot: As the infection progresses, the mold penetrates the buds, causing them to rot from the inside. Affected buds become brown, mushy, and may emit a foul odor.
  3. Leaf and Stem Damage: Botrytis can also affect the leaves and stems of cannabis plants, leading to wilting, discoloration, and tissue necrosis.

Impact on Cannabis Plants:

Botrytis poses significant risks to cannabis cultivation and can have the following impacts:

  1. Reduced Yield: Infected buds become unusable and must be removed, resulting in a decrease in overall yield.
  2. Decreased Potency: The fungal infection can degrade the quality and potency of the remaining unaffected buds.
  3. Spread and Contamination: Botrytis is highly contagious and can quickly spread throughout a cultivation area, affecting multiple plants. The fungal spores can also contaminate equipment, surfaces, and other plants.

Prevention and Management:

Preventing and managing botrytis requires diligent cultivation practices and adherence to good hygiene. Here are some techniques to consider:
  1. Optimal Environmental Conditions: Maintain proper airflow and ventilation in the cultivation area to reduce humidity and prevent excess moisture.
  2. Plant Spacing: Provide adequate spacing between plants to promote airflow and minimize the chance of fungal spores settling on nearby buds.
  3. Pruning and Defoliation: Regularly prune and remove any dead or dying plant material, as these can serve as entry points for botrytis and create favorable conditions for its growth.
  4. Humidity Control: Use dehumidifiers or fans to control humidity levels and minimize moisture buildup.
  5. Sanitation and Cleanliness: Maintain a clean cultivation area by regularly sanitizing tools, equipment, and surfaces to prevent the spread of fungal spores.
  6. Early Detection and Removal: Inspect plants regularly for any signs of mold or rot and promptly remove any affected buds or plant material to prevent further spread.

Integrated Pest Management (IPM):

Implementing an Integrated Pest Management (IPM) strategy can help prevent and manage botrytis effectively. This approach involves combining various preventative measures, such as regular monitoring, biological controls, and the careful use of targeted fungicides when necessary.

In summary, botrytis, or gray mold, is a fungal disease that can affect cannabis plants, causing grayish-brown mold and rot in buds. It can significantly impact plant health, yield, and potency. Preventing botrytis requires maintaining optimal environmental conditions, practicing good hygiene, and implementing an Integrated Pest Management approach. Regular monitoring and early detection are crucial for effective management and minimizing the spread of the fungus.


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