Photodegradation

Photodegradation refers to the chemical breakdown of cannabis compounds—particularly cannabinoids and terpenes—when exposed to light over time. UV radiation and visible light can degrade THC into CBN (cannabinol), alter terpene profiles, and reduce overall chemical stability in stored plant material or extracts. This process is a key consideration in seed storage, dried flower preservation, and extract stability. Breeders and cultivators working with genetics archiving or long-term seed banks must account for photodegradation when designing storage protocols. Understanding light's role in compound degradation helps inform best practices for maintaining genetic fidelity and chemical consistency across generations.

Breeders preserving elite genetics or maintaining seed banks use light-blocking storage methods to slow photodegradation and protect cannabinoid and terpene profiles over time. Knowledge of photodegradation rates informs decisions about packaging, storage environment control, and viability testing protocols in long-term preservation programs.