These rot down into a good mulch (compost). Unwanted living plants (or weeds) can be discouraged by covering with mulch/compost. Also organic mulch, especially mushroom compost, shows good results. A layer of wood chip mulch prevents some weeds from sprouting. The soil underneath the plastic mulch stays loose and well aerated. The plant prefers slightly acidic soil with good drainage and rich in mulch. Trail surfaces vary from concrete sidewalks to wood mulch, gravel and earthen construction. After planting, placing a circumference of mulch surrounding plants functions to lessen evaporation. Cuttings and leaves also used as mulch and animal fodder. The slurry often has other ingredients including fertilizer, tackifying agents, fiber mulch, and green dye. The effect of mulch upon soil moisture content is complex. Wagons can be useful for moving dirt, wood chips, mulch, or gravel. Gravel can serve as an inorganic mulch. Used coffee grounds may be used for composting or as a mulch. The material remaining after processing can be safely used as mulch or fertiliser.