Back to Earth CCB Acidified Composted Cotton Burr 2 cu.ft.Soil Mender Back to Earth Acidified Composted Cotton Burrs consists of our unmatched Composted Cotton Burrs, screened . This makes BTE Composted Cotton Burrs an ideal general- purpose mulch for amending clay or sandy soils and acid loving plants. This product contains no chemicals, weeds, insects, or harmful pathogens. Soils low in organic matter and humus or with poor tilth and structure cannot be rejuvenated with chemical fertilizers. Back to Earth compost can quickly start improvement of such soils, since it begins to function immediately, restoring vital organic matter and humus to soils, regardless of soil conditions.