I killed my old grass, mended the soil and spread new KB seed and covered with straw to help keep the moisture in. New seed has germinated nicely, but the straw did too! I now have lots of hay growing up in the new lawn, what should I do? Will this new hay ruin the new lawn or will it go away with the first mowing? In the spring I am going to do the same to the back yard, what should I do differently?