How to Prevent and Treat Mold on Cannabis Plants

Introduction

Mold is one of the biggest threats to cannabis crops, especially in humid environments. Whether growing indoors or outdoors, preventing mold is essential for maintaining healthy plants and a clean harvest.

Common Types of Mold Affecting Cannabis

• Powdery Mildew: White, powder-like mold that spreads on leaves and buds.
• Botrytis (Bud Rot): Gray mold that causes buds to decay from the inside out.
• Root Rot: Occurs in overly wet soil or hydroponic systems.

How to Prevent Mold Growth

• Control Humidity: Keep humidity levels at 40-50% during flowering.
• Improve Air Circulation: Use fans and ventilation to reduce stagnant air.
• Avoid Overwatering: Mold thrives in excess moisture, so allow soil to dry properly.

How to Treat Mold on Cannabis Plants

• Remove Infected Areas Immediately: Cut off affected leaves or buds.
• Apply Organic Fungicides: Neem oil, potassium bicarbonate, or milk sprays can help prevent mold.
• Improve Grow Room Conditions: Adjust ventilation and dehumidifiers as needed.

Key Takeaways

• Mold thrives in high humidity and poor airflow—prevention is key.
• Powdery mildew and bud rot are common cannabis molds.
• Removing mold-affected parts early can prevent total crop loss.

Frequently Asked Questions

Q: Can I still smoke cannabis that has mold on it?
A: No, consuming moldy cannabis can be harmful to health.

Q: What’s the best way to prevent mold in outdoor grows?
A: Plant in well-draining soil and avoid overwatering—also, prune plants for better airflow.

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