Iron Deficiency Chlorosis

Iron deficiency chlorosis (IDC) is a nutrient disorder characterized by yellowing of new growth while leaf veins remain relatively green—a pattern distinct from nitrogen deficiency. This condition occurs when plants cannot access or utilize available iron in the soil, often due to high pH, poor root health, or imbalanced nutrient ratios. While not a genetic trait itself, IDC susceptibility varies among cannabis cultivars based on root vigor, nutrient uptake efficiency, and overall plant genetics. Breeders working with genetics from different regions and parent lines have observed varying tolerance thresholds to iron stress. Understanding IDC is relevant for indoor growers managing hydroponic systems, soil pH control, and nursery operations where seedling vigor affects propagation success.

Breeders select parent plants demonstrating robust root development and efficient micronutrient uptake to reduce IDC susceptibility in their lines. Strong vigor traits and healthy root architecture are indirect markers used in breeding programs to enhance overall nutrient resilience across growing environments.