Martins Organic Straw Mulch is wheaten straw, compressed tightly into a bale.Straw Mulch is a natural, organic user friendly mulch that is easy to use. Straw Mulch provides an economical way to mulch your garden. Martins Organic Straw Mulch can be used for all types of mulching, including roses, garden beds, vegetable gardens, pots, trees and shrubs. This mulch is used as a protective barrier that assists in moisture retention, conditioning the soil and reducing weed growth. It will break down over time, adding organic matter to the soil. The natural approach to controlling weeds, aid in water retention, encourage earthworm activity and protect plants root systems for a healthier hardier garden.