Leaf Margin Necrosis

Leaf margin necrosis refers to browning or desiccation that appears at the edges of cannabis leaflets, often observed during late vegetative or flowering phases. This trait can result from environmental stress (low humidity, high heat, nutrient imbalance, salt accumulation) or genetic predisposition in certain cultivars. Some lineages—particularly those with rapid growth rates or dense foliage—show increased susceptibility to margin necrosis under suboptimal conditions. Breeders distinguish between environmentally triggered necrosis and heritable forms, as consistent appearance across controlled grows suggests genetic influence. Documentation of this trait in breeding records helps identify which parent lines require specific environmental management or offer resilience to edge-burn patterns.

Breeders working in commercial and indoor settings track leaf margin necrosis to assess plant vigor, nutritional efficiency, and environmental sensitivity. Selecting against severe necrosis in breeding lines can improve visual appeal and overall plant health, while understanding its triggers informs cultivation protocol recommendations.