Chemlawn had an introductory offer to treat my entire lawn for $19.99. I invited them to come on Saturday when I would be home, but they came on Friday instead. I came home to find a "your lawn has been treated by Chemlawn" sign in front and back yard. Suspicious since I hadn't unlocked my back gate, I called to inquire about the sign and the fact that they billed me $40 for the visit. Not only did they claim to have treated a yard they didn't have access to, then they had the nerve to overcharge me! They agreed to send someone out to treat the back yard the next weekend, I paid the $19.99 and sent them on their way. Obviously they focus on front yards to impress the neighbors (free advertisement), while unseen backyards are ignored. Be watchful. Beware.!