The marijuana leaves turn yellow due to disease. However one need not worry since it is an easily preventable form of disease. This is simply deficiency or deprivation illness. This is because the marijuana lacks some necessary ingredient in the feeding.
When there is a shortage of iron, it leads to the yellowing of leaves. In fact the pH value plays an eminent to prevent such deficiency disease. It is important to keep the pH value around 5.8. In case the value turns out to be too low, the leaves won’t be able to absorb calcium as well. As such the osmotic process is also affected.
Besides, the shortage of primary nutrients also leads to deficiency disease. In this there is a lack of nitrogen and due to nitrogen shortage there is a delay in growth and makes the lower-most leaves turn yellow and drop off.
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