A common concern we hear from people is about bare spots in their yard.  We are not talking about small spots but larger areas where the grass is not there and there is just bare ground.  The purpose of a lawn care program is to care for the grass that is currently growing. The treatment program in itself is not going to create new grass or cause grass to start growing in an area.  To get grass in these areas you will have to install sod or consider using a grass seed. The biggest question you need to first answer is why is the grass not growing there now. Typically it is due to shade, water, soil conditions or something else.  These issues will need to be addressed before you will be able to fix the issues of no grass. Once the new sod is installed you can then treat the area like normal! Hope this helps!