Why is new grass seed covered with straw? Can any kind of straw be used? -Jack
When seeding new lawns, it’s generally recommended that a thin layer of mulch be scattered on top. That mulch really only has one purpose – to hold in moisture to keep the seeds from drying out. It’s not as necessary when overseeding older lawns, because the existing grass helps hold in moisture.
As for what kind of mulch to use, there are several options:
Wheat, Barley, or Oat Straw: Yellow grain straw is the most popular choice. It’s inexpensive, readily available, relatively free of seeds, and as your new lawn grows, it’s pretty easily chopped up with the lawn mower. Don’t use hay, as it contains too many seeds.