Magnesium Nutrition

Magnesium nutrition refers to the plant's uptake and utilization of magnesium, an essential macronutrient critical for chlorophyll synthesis and enzyme function in cannabis cultivation. Magnesium deficiency typically manifests as interveinal chlorosis—yellowing between leaf veins while veins remain green—usually appearing first on older foliage as the plant remobilizes the nutrient. Cannabis plants require consistent magnesium availability throughout vegetative and flowering phases, with demand often increasing during peak biomass accumulation. Soil pH, calcium-to-magnesium ratios, and nutrient solution formulations directly influence magnesium bioavailability. Breeders and cultivators monitor magnesium status as a baseline indicator of overall nutrient cycling and plant health, though genetic variation in nutrient efficiency has been observed across lineages.

Breeders selecting for robust phenotypes often evaluate magnesium responsiveness and nutrient use efficiency under controlled feeding regimens. Cultivars developed for high-stress or outdoor environments may demonstrate varying capacity to absorb and retain magnesium under suboptimal soil conditions.