by Greg Green
pH is a way of measuring how much acid and alkaline is in the soil. The pH scale runs from 1 – 14. 7 is neutral, 0 is very acidic and 14 is very alkaline. Cannabis plants in soil like a pH of 7. When choosing your soil you should be looking for a pH of 7. It should tell you this on the bag. Going above or below this mark can cause your plant problems during growth. Small pH meters can be bought in most gardening shops and can be used to measure the overall pH of your soil.