Chlorosis

Chlorosis is a physiological condition in cannabis plants characterized by yellowing or bleaching of leaf tissue due to reduced chlorophyll production, rather than a terpene compound. This visual symptom can result from nutrient deficiencies (nitrogen, magnesium, iron), pH imbalances, overwatering, or genetic factors affecting chlorophyll synthesis. Breeders and cultivators distinguish chlorosis from natural senescence or anthocyanin expression, as persistent chlorosis typically indicates a cultivation or genetic problem requiring intervention. Understanding chlorosis markers helps identify plant health issues early in the growth cycle. Documentation of chlorosis-resistant versus chlorosis-prone phenotypes within breeding lines provides valuable data for cultivar selection and environmental optimization.

Breeders monitoring seedling vigor and phenotypic stability often track chlorosis susceptibility as an indicator of nutritional efficiency and genetic robustness. Selecting against excessive chlorosis in early generations helps develop cultivars better suited to varying growing conditions and nutrient regimens.