Planted a third of our impound in Barynyard grass this year that I purchased from River Refuge seed . Amazing growth and amount of seed its produceing. Got lucky late august and got a few weeks of good rains on it. Also have naturally occurring Smartweed and I think a sedge that took off once that rain saturated soil.Otrher 2/3rds of impound are Barnyard grass native to area and some smartweed mixed in. About half the production from that area as compared to newly planted. Problem is I,m afraid newly planted area is so thick and tall its not going to lay down. Would mowing this area be a benefit or would you think mowing debris will cover seed. Once water gets up on impound there would still be 2' height of Planted Barnyard above water level without mowing. Need advice on should I mow or not. Forgot to mention that impound is only about 2 acres so I,m thinking I,ll need to show some water or am I wrong?