First off I'm in the mowing business and wanting to add the feature to customers of fert/weed control. I don't want to go through the licensing and Ins. ect at this point so I'm trying to sub it out. This year I've tried out a company on three different apartment complex's I mow. They started in April and I've paid for 6 fert/weed control applications. They just finished up their last application over a week ago and there is still weeds in the yard. In past these properties were not covered in weeds but weeds were present hints hiring a company to treat them. The question I have is should I still have weeds present in my lawn after a season of treatment specially If I've seen the same weeds the past 3 to 4 months.