Peat is a type of partially decomposed plant matter that is often found in peat bogs. Peat has a high water retention capacity and can add texture and organic matter to the soil. Peat is sometimes used in bonsai soil mixes, especially for plants that prefer moist conditions. However, peat can also lower the pH of the soil and make it more acidic, which may not suit some plants. Peat should be used sparingly and mixed with other components such as grit, perlite, vermiculite or baked clay balls to improve drainage and aeration. Peat can also be used to wrap the roots of some plants, such as ferns, to create a kokedama ball, which is a type of Japanese moss ball.