Leafy greens are dark green, shallow-rooted plants that demand plenty of water for proper growth. The term is non-scientific and has risen in popularity as the health benefits of leafy greens have been highly reported for decades. Common leafy greens include, but are not limited to, herbs, chards, beans, spinach, and various types of lettuces. These plants are extremely easy to grow and do not require a lot of care or soil preparation.