On Sept. 21st I planted some grass seed and mulched it with straw. It is...
You do not need to remove the straw. Raking up the straw would disturb the young grass seedlings. When the grass is ready to mow, about when it reaches 3-4 inches, mow the grass and the straw along with it. This will help to break it down. Subsequent mowings will keep breaking it down and it eventually will disappear.