Thank you guys for the tip I will try it , one little more question, do I spray the round just on top off the mulch or try to make some holes in the news paper, thank's for your time..
Just spray what is up and you may have to do this a few times. Or you know you can spray vinegar and it will sterilze the ground also. We use this method in our gravel beds and do it a couple times a year.
I use it half and half due to it does sterilize the ground, one never knows when one might need that space?