So some of my northern MA neighbors are on the every year dethach kick... but I read that some thatch is actually healthy for the lawn. I dethatched last year Spring 2013. Aerated/seeded in the Fall 2013 before winter. It doesn't appear I really have any thick thatch buildup right now. There are the few browny areas that are trying to green up for spring. And it stresses the lawn with each dethatch. Do I just need to be patient here?