Types of Mulch:
Organic mulches include formally living material such as straw, grass clippings, leaves, compost, wood chips, sawdust, shredded bark and pine needles.
In-organic mulches include black plastic and landscape fabrics (also known as geotextiles)
While both types of mulch can discourage the growth of weeds, it is the organic mulch that while new or old, is constantly providing nutrition to your soil, plants and grass. Inorganic mulches do not contribute to the quality or enrichment of the soil as it decays. However, one benefit of inorganic mulch is that it radiates late and warms the soil during the warmer months of the year which can be good for certain plant types that prefer to stay warmer throughout the night (for example, vegetables).