Magnesium Sensitivity

Magnesium sensitivity refers to a heritable trait in cannabis plants affecting nutrient uptake regulation and chlorophyll synthesis efficiency. Plants exhibiting magnesium sensitivity may show visible deficiency symptoms—interveinal chlorosis on older leaves—at lower soil magnesium concentrations than non-sensitive varieties. This classification has breeding relevance for growers working in specific substrates or hydroponic systems where magnesium availability varies. Sensitivity levels appear linked to genetic differences in ion transporters and nutrient partitioning pathways. Understanding magnesium sensitivity helps breeders develop cultivars better suited to particular growing mediums and nutrient regimens.

Breeders select for or against magnesium sensitivity depending on target growing environments. Cultivars with lower sensitivity may perform more consistently across variable substrates, while sensitive lines require precise nutrient management but may achieve higher nutrient-use efficiency under optimized conditions.