In this video, Doc explains the importance of proper plant nutrition. Doc covers what Cations (Cat-eye-ons) – a positively charged molecule – are commonly present in plants: Ca++ (Calcium), Mg++ (Magnesium), K+ (Potassium), and NH4+ (Nitrogen / Ammonia). These are the most important Cations for plant growth as nutrients. This video will explain how to make these nutrients available in your plants. Good Growing!