Yo! Most growers have actually already given plenty of iron to their cannabis plants since it is found abundantly in most tap water. If you’re using qualitly cannabis-friendly nutrients, you probably don’t need to worry about adding more iron.
Iron deficiency symptoms caused by true lack of iron are more likely to appear when a grower is using heavily filtered or reverse osmisis water to feed plants since any iron has been removed. There are other nutrient problems that can trigger the symptoms of an iron deficiency, for example problems with calcium and magnesium, or an excess of copper can all lead to symptoms of an cannabis iron deficiency. Recently overwatered plants can also develop multiple symptoms including Iron deficiency.
Get CaliMagic If you suspect you have a iron deficiency even though the pH is correct, or if you believe your system is truly lacking in iron, you may want to consider flushing your system with clean, pH’d water (if on schedule, you can do this alongside a dose of your regular nutrients) and add a supplement that contains Iron, Calcium and Magnesium.
Cannabis loves Calcium and Magnesium, and they work hand and hand with Iron. A Calcium-Magnesium supplement can help prevent all of these deficiencies from appearing.