|Is there a good product to eradicate nut grass that is starting to take over the lawn?
I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
For nutsedge in a lawn your have two basic product options, Image and Manage. These will suppress it but are not a one-shot panacea. Time and persistance is required.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!