Rice hulls are commonly used as a soil amendment as well as a weed control. Here at DMF Gardens we use it for both. Rice hulls are the outer shell from a grain of rice that is removed after harvest. A couple benefits of adding it to your soil is it lightens the soil which helps with aeration and it also helps with moisture retention. To use it as a weed control simply spread a thin layer over the area you are wanting to suppress weeds. It is available for purchase in bulk by the yard.