what is seedless straw
1 Response. Hi: I woiuld not use hay for a mulch because it is a very different product from straw, Hay is cut before maturity of the grass and so it is green to some degree and may well include seed of the grass. Straw is the residue left over after the seed of the grass or grain is removed. The straw is often bundled and used for other applications and world-wide, it is used extensively as a mulch. And it is well-documented to lower soil temperatures, cvonserve moisture and suppress weeds, among other contributions.