Brown spots on leafs after flowering started

Calcium deficiency can indeed be a common issue during flowering, especially if you're using peat moss as your grow medium. Peat moss tends to have low levels of calcium and can lead to deficiencies as the plant enters the flowering stage, where it requires more calcium for bud development. Symptoms of calcium deficiency often manifest as leaf problems, including yellowing or browning at the tips and edges of the leaves, as well as potential leaf curling or distortion. However, it's essential to carefully observe the symptoms to confirm the deficiency accurately. To address this issue, you can consider supplementing your feeding regimen with a calcium-rich nutrient solution. Dynomyco is a great product, but it might not contain sufficient calcium alone to meet the plant's needs, especially during flowering. You can look for calcium supplements or additives specifically formulated for cannabis cultivation and adjust your nutrient schedule accordingly.