It was after 1992. Somewhere around 1997. How did they do sales prior to that period?
Someone else can probably answer that better than me. But I think it was around the mid-1980's when both ChemLawn and TruGreen (separate and independent companies at that time), started their annual early spring telemarketing campaigns. Before then, it may have just been print advertising. It was in 1987 when they both got bought and owned by parent companies. I would presume that is when they really ramped up the telemarketing.