Fertigation is a way of fertilizing plants by mixing fertilizers into the water that is used to give the plants a drink. When you water your plants, you usually use a hose or a watering can, but when you fertigate, you mix the fertilizer into the water first before giving it to the plants. This is better for plants because the fertilizer goes directly into the soil when the water is applied, and the plants can use it right away. Fertigation helps plants grow and stay healthy!