◉ Nutrient Supplements: You can use pre-mixed nutrients specifically designed for plants, which contain nitrogen. Nitrate of soda or organic fertilizers are also good sources of nitrogen. Most plant nutrients available in stores include nitrogen as a component. ◉ Adjust Nutrient Levels: If you are already using nutrient supplements but still observe spreading nitrogen deficiency, it is essential to determine if there are other factors contributing to the yellowing. Check the pH level at the root zone since improper pH can hinder nutrient absorption by the roots. ◉ Vegetative Stage: During the vegetative stage, cannabis plants require higher levels of nitrogen. Ensure your nutrient regimen provides sufficient nitrogen during this growth phase. Look for complete plant foods with high nitrogen content. ◉ Flowering Stage: As the plant transitions to the flowering stage, lower levels of nitrogen are necessary. Choose nutrient systems specifically formulated for the flowering stage, often labeled as "Bloom" or "Flowering" nutrients. These products have reduced nitrogen levels to support proper bud development. ◉ Remember that towards the end of the flowering cycle, it is normal for cannabis plants to exhibit some yellowing of leaves, as nitrogen is mobilized to aid in bud development. As long as the yellowing does not spread rapidly up the plant, there is usually no cause for concern.