Leafy greens, such as spinach and lettuce, are versatile plants that grow fast in hydroponics. They are the easiest plants to grow for hydroponic beginners, and in only a couple of weeks, you will be able to have a harvest. Leafy greens aren’t just for salads, they also go great with wraps and sandwiches. When growing on a larger scale, you can use nft systems. When growing smaller amounts, both ebb and flow systems and deep water culture variations work well.