Here in the Midwest I do not run into very many Zoysia lawns to deal with so i am new to the maintenence issues with it. I have a "potential" who was asking about what they (I) should do to thier lawn to improve it. It is 95% Zoysia that is 20+ years old and looks to be in very good condition but they have several places that are so thick to don't think I part it to find thatch if I had to. they are asking about dethatching, aeration or burning. What is a good start up procedure for dealing with Zoysia? Thanks!