Yin attracts yang, and yang attracts yin. Herbs with a yang nature grow in a yin environment, herbs with a yin nature grow in a yang environment. Knowing the habitat and growing conditions of a herb provides clues to the nature of the herb. For example, aloe vera grows in warm places, and grows fast when there is water, which indicates that aloe vera is a herb that has cold and dry properties, and is able to clear heat, and dry dampness. By contrast, ginseng grows in cold damp forests, so ginseng has a warm nature, and the ability to warm kidney water and free water flow. Lotus grows in the mud and has a refreshing nature and ability to clear dampness.