Magnesium Deficiency Expression

Magnesium deficiency expression refers to the visible symptoms that appear when cannabis plants lack sufficient magnesium availability, typically manifesting as interveinal chlorosis (yellowing between leaf veins) on older foliage while veins remain green. Magnesium is a core component of chlorophyll molecules and plays critical roles in photosynthesis and enzyme function. This deficiency pattern is commonly observed in soil and hydroponic systems with improper pH buffering, excessive potassium competition, or insufficient nutrient concentration. Breeders and cultivators document magnesium deficiency expression as a diagnostic trait for nutrient management rather than a genetic characteristic, making it a valuable indicator of cultivation conditions rather than strain-specific genetics.

While not a heritable trait, breeders monitor magnesium deficiency expression patterns across cultivars to assess vigor and nutrient uptake efficiency under standardized conditions. Selective work occasionally focuses on identifying genotypes that show resilience or efficiency in magnesium utilization across different growing media.