Chlorosis Yellowing

Chlorosis yellowing refers to a nutrient deficiency condition where cannabis plants display yellowing or pale coloration in leaves, typically beginning with interveinal areas while veins remain green. This occurs when plants cannot adequately absorb or utilize essential micronutrients—commonly iron, magnesium, manganese, or nitrogen—despite soil availability. The condition is frequently observed in hydroponics, high-pH substrates, or under environmental stress. While chlorosis itself is a physiological response rather than a disease, severe cases can reduce photosynthetic capacity and overall plant vigor. Breeders and cultivators track chlorosis resistance as a marker of nutrient efficiency and environmental adaptability in breeding programs.

Breeders working in strain development often select for plants showing strong nutrient uptake efficiency and resilience to chlorosis under varied growing conditions. This trait is particularly relevant in breeding for hydroponic-adapted cultivars or strains intended for suboptimal soil environments.