I've made a new garden bed (for shrubs and perenials) of about 40 feet wide by appx 7 feet deep. Now, I asked a few people, my sister in law for example which is an avid gardener and has numerous beautiful gardens what she though. My dilemna is this: I didn't remove the grass before putting the soil on top. I've got about 6 inches of topsoil with compost and manure. I did remove the sod at least a foot all around the bed. I will mulch this heavily. Now that it's done, other people tell me I HAD to remove the grass or it's going to grow right through. My sister in law did it both ways and sees no difference between her beds where she did remove the grass prior to adding dirt and the ones where she left it. I felt ill just thinking about having to remove all the dirt and restarting it. Anyone has experience in leaving the grass underneat or not? Thanks!