Kill Crab Grass before I rennovate?
We are preparing to landscape a yard that has been neglected for decades. The existing "lawn" which is basically a mixture of what grows naturally when watered, has lots of crab grass in it during the summer months. My question is what's the best way to prevent the crab grass from invading our new sod and surrounding planting beds? Should I use a preemergent now and then just till the existing grass before putting the sod in. Or should I not bother and remove the existing grass entirely before the crab grass germinates and then do the preemergent? The people at the gardening store told me I can do nothing to kill the crab grass until it begins to grow in spring? We want to have the new sod in around spring. Any advice greatly appreciated.