Frost Coverage

Frost coverage refers to the visible trichome density and crystalline appearance on cannabis flower and leaves, characterized by abundant glandular trichomes that create a white, sparkling aesthetic. This trait is primarily determined by genetics, with some cultivars expressing notably higher trichome production than others across their phenotypes. Breeders have long selected for frost coverage as a visual marker of potency and terpene production, though trichome density alone does not guarantee cannabinoid or terpene concentration. The trait develops progressively during flowering, with peak expression typically occurring in the final 2–3 weeks before harvest. Environmental factors including light intensity, temperature fluctuations, and nutrient balance can influence the degree of trichome visibility, making frost coverage a trait influenced by both genotype and cultivation conditions.

Breeders working in frost-forward lineages intentionally select parent plants displaying high trichome production to concentrate this trait in offspring. Frost coverage is commonly used as a phenotypic selection criterion in stabilization programs, though breeders recognize it as cosmetic rather than directly predictive of chemical profile.