Living Soil - LST & ScrOG

If you think your cannabis plant might have a magnesium deficiency, take a look at the leaves. They might be turning yellow between the veins, especially on the older leaves. You might also notice some browning or spotting. To fix this, you can get some magnesium sulfate – also called Epsom salts – and mix it with water. Then, spray the solution on the leaves or add it to the soil. You could also use a liquid fertilizer that has magnesium. How often you need to do this depends on how bad the deficiency is. But usually, treating it every week or two should be enough.