I have a customer who has a mulched bed in front of his house. It measures about 8 foot by 32 ft. and it has weeds and sod (grass growing in it. He wants the grass and weeds out and a layer of new mulch put in. It is not a flower bed, but one with afew small bushes scattered here and there. My question: what's the best way to do this so the weeds and grass doesn't come back up through the mulch by the middle of the season? Sjould I hand pull the stuff, kill it first with round up, till it under. Any pointers would be appreciated.