PH (potential of hydrogen) is a numerical way of defining the level of acidity or alkalinity of the nutrient solution we're providing our cannabis plants with. It plays a major role in the absorption and metabolism of nutrients, which directly affects the development and the health of our plants. Since it's responsible for the optimal distribution of nutrients, we could say that it directly affects the plants' well-being, giving rise to hardy, vigorous plants that are less likely to suffer from pests and diseases.

• More info: How to regulate the pH balance of your cannabis growing medium