Straw Phenotype

The Straw phenotype refers to cannabis plants displaying pale, yellowish, or bleached stem and leaf coloration, often accompanied by reduced chlorophyll production. This trait can arise from genetic predisposition, environmental stress (nutrient deficiency, light intensity, temperature fluctuation), or viral infection. Breeders have documented straw-type expressions across multiple lineages, though the underlying genetic mechanisms remain incompletely characterized. The phenotype is sometimes heritable within certain cultivar families, making it relevant to selective breeding programs focused on plant vigor and visual distinction. Straw phenotypes typically require careful environmental management during propagation to differentiate genetic expression from stress-induced symptoms.

Some breeders intentionally select for or against straw phenotypes depending on cultivation goals and market positioning. Understanding whether straw coloration is genetically fixed or environmentally triggered is critical for consistent seed line development and F1 hybrid stability.