Kratky hydroponics is a no-pump, no-electricity hydroponic method ideal for anyone wanting a low-maintenance gardening solution. Plants grow in nutrient-rich water, absorbing oxygen from the air gap created as water levels drop. Kratky hydroponics is perfect for small spaces, home growers, and beginners looking to grow lettuce, herbs, and leafy greens easily while saving time, water, ... https://www.greenandprosperous.com/gardening-courses-online