High Uv Phenotypes

High UV phenotypes refer to cannabis cultivars that display pronounced responses to ultraviolet-B (UVB) radiation exposure during cultivation, often developing elevated levels of secondary metabolites including cannabinoids and terpenes. These phenotypes are characterized by increased trichome density and pigmentation changes when grown under UVB supplementation, a trait breeders have selected for across diverse genetic backgrounds. Lineage records frequently report that plants exhibiting robust UV-responsive traits come from lineages with strong resin production genetics. The trait's heritability varies significantly depending on underlying genetics, environmental conditions, and cultivation practices. Understanding UV phenotypes is relevant for breeders optimizing production methods and researchers studying how light spectrum influences cannabinoid expression.

Breeders working in controlled-environment cultivation often select for high UV responsiveness to maximize secondary metabolite accumulation without relying solely on extended flowering times. This trait is particularly valuable in research and breeding programs focused on terpene-dominant or cannabinoid-dominant phenotypes under defined light conditions.