Bud rot, also known as botrytis, is a fungal infection that causes cannabis flowers to rot from the inside out.
WHAT IS BUD ROT?
Bud rot is caused by the fungus Botrytis cinerea, which thrives in high humidity, poor airflow, and dense flowers. The infection often starts deep inside the bud, making it difficult to detect until damage is advanced.
Affected buds may appear brown, gray, or mushy and can spread spores rapidly.
HOW WE GET BUD ROT
Growers encounter bud rot when:
– Humidity is too high during flowering
– Airflow is insufficient inside dense canopies
– Plants are overcrowded
– Late flower conditions are poorly managed
Immediate action is required when bud rot is discovered.
WHY IT MATTERS
Bud rot matters because:
– It destroys flowers from the inside
– It spreads quickly to nearby buds
– Infected buds are unsafe to consume
– Late-stage infections can ruin entire harvests
Prevention is critical, especially in late flower.
LIMITATIONS & NOTES
Bud rot is often invisible until significant damage has occurred. Removing infected material promptly and improving environmental conditions are key to stopping spread.