Hay Production with Native Grass Forages | Agweb.com

Because of the taller growth habit of native grasses, it is important not to harvest them too closely leave an 8 inch residual height to maintain vigorous, productive stands. Using a “shoe” or “boot” on your mower (fabricated or purchased from your dealer) can enable you to consistently harvest at these greater heights. Repeated harvesting to lower heights will weaken stands, increase weed pressure, and reduce yields. Similarly, cutting hay late in the growing season (after late August) also can lead to weakened stands because such harvests remove so much plant energy just prior to fall dormancy.

Source: Hay Production with Native Grass Forages | Agweb.com