How to kill grass and weeds growing in Irish Moss?

After a good rain (or soaking), hold moss down with one hand while gently pulling weeds out through fingers with other hand. Apply sulfur to moss (makes soil more acid which moss likes but grasses don't). Keep watered (encourages moss, makes grass roots shallow and "lazy") Don't use roundup. Bad for environment - killing and mutating little froggies that eat mosquitoes, etc. Good luck. It will be beautiful