White Phenotype

The 'White Phenotype' refers to cannabis plants exhibiting heavy trichome coverage that creates a frosted or white-coated appearance on flowers and sometimes leaves. This visual trait results from a dense accumulation of resinous glandular trichomes rather than pigment variation. White phenotypes are commonly associated with particular genetic backgrounds, including lines derived from White Widow, White Rhino, and other cultivars selected for crystalline resin presentation. Breeders have long tracked this characteristic as a marker of resin production potential, though visual appearance alone does not determine cannabinoid or terpene content. The trait appears across multiple chemotypes and cannabinoid profiles, making it a phenotypic descriptor rather than a chemically defined family.

Cannabis breeders monitoring white phenotypes often use trichome density and visual frost as a selection criterion for breeding stock, as it correlates with consistent resin layer development across generations. Maintaining white phenotype expression requires attention to genetics, environment, and maturation timing, making it a useful tracking tool in formal breeding programs.