What is Gypsum and How Does It Help My Lawn & Garden

First, what is gypsum? Chemically, gypsum is calcium sulfate (CaSO4); functionally gypsum can be seen as a soil amendment, soil conditioner, or fertilizer. A soil amendment is anything worked into the soil to make it a more hospitable environment for plant growth and development (gypsum, synthetic conditioner, sawdust, or other organic material), while a soil conditioner is added specifically for the purpose of enhancing physical soil properties such as soil structure.