However, straw and deciduous leaves are not recommended as they tend to pack, thus not allowing adequate water penetration. Straw also decomposes quickly. Black plastic has been used effectively as a mulch in some countries. However, drip irrigation tubes must be placed underneath the plastic, fertilizer application is difficult, and plastic usually deteriorates after 2 to 3 years. Weed matting, consisting of a woven polypropylene fabric, is used successfully as a mulching material in Michigan and Australia.
Water passes through the mat.
Edges must be covered with soil to keep the weed mat in place. This fact sheet is adapted from Oregon State University Extension Publication PNW215, Highbush Blueberry Production .