Frosty Phenotype

The 'frosty phenotype' describes cannabis plants exhibiting heavy trichome production across flowers and sometimes leaves, creating a crystalline or frost-like visual appearance. This trait is polygenic, influenced by multiple genes and environmental factors including light intensity, temperature fluctuations, and growing duration. Trichome density varies significantly within and across strain families—some lineages like GSC and Bubble Hash crosses are frequently selected for this characteristic. Frosty phenotypes are visually distinctive but trichome count alone does not determine cannabinoid or terpene profiles. Understanding frosty expression helps breeders recognize genetic markers and select for consistent resin production across generations.

Breeders working with frosty phenotypes often use visual trichome density as a secondary selection marker alongside cannabinoid testing. This trait can indicate vigorous resin biosynthesis pathways, making frosty-expressing lines valuable for breeding programs targeting high-resin cultivars or hash-production genetics.