The answer to 'what is mulch' is mulch is a protective layer of material that is spread on top of the soil around plants. Mulch is typically made from organic materials like wood chips, bark, leaves, straw, or compost. It is used in landscaping and gardening to help retain moisture in the soil, suppress weeds, and improve the overall health and appearance of plants.
Mulch helps insulate the soil, keeping it cooler in the summer and warmer in the winter. It also helps to prevent soil erosion and compaction, and can improve the fertility of the soil as it breaks down over time. Mulch comes in a variety of colors and textures, and can be used around trees, shrubs, flowerbeds, and vegetable gardens.