MD not sure if you are a friend or foe but... regarding the form letter, our customers are not as dumb as you might think (yours and mine). I have not had a single customer question the information or results seen in that form letter. I do agree there is more information than some may care for but each section has its merits and must be explained. I am OK with educating my customers in what I am doing on their property. I work for them and they have a right to question everything I do. After reading the Purdue University Turf-tips link posted in this thread it only supports what I have been doing in the past. I may substitute that section from Turf-tips for what I am using strictly to save a few trees. In regards to the "new evidence," that would be recent studies done by agronomy schools and fertilizer suppliers that support what your grandfather already new. It proves that late fall fertilization isn't theory but is proven technique. Just because someone tells me to do something doesn't mean I will do it. I want supporting documentation or knowledge for everything I do. Just like the information written in this entire thread, each member needs to make his or her mind up for themselves what to do. In regards to your statement that "NOT ALL" bluegrass lawns will green up earlier. That is a blanket statement about the results Purdue and others have seen not a guaranteed result. Soil analysis and past practices will dictate how those lawns respond. I am glad you have had or seen success with a heavy spring application of nitrogen and would encourage you and others to continue with that. I too have seen an awesome lush, green lawn caused by high nitrogen fertility in the spring. Some of the best looking lawns in the neighborhood. I have also seen those people (not customers) cutting their lawn every four days. I have also seen those lawns weak and disease infested in the heat of the summer due to that heavy early spring fertilization. I have also gained some of those people as customers after they screwed up their lawns only to be happy with the late fall fertilization I provide. Finally, I will continue with the late fall applications since again University studies have supported what I and others here have seen in the field. Specifically, a healthy lawn year round, fewer high nitrogen fertility diseases and happy customers once they understand the theory behind the science.