I hate to sound ignorant. But I have alot to learn. I have read myself to death on this site, and love every minute of it. However, after searching for this, I can't really get the exact answers for my questions. 1)So, "overseeding" , Is this spreading grass seed over and established lawn, at a higher rate than usual? 2) "reseeding" is this a lower rate than usual? "Usual" meaning a first time seeding. 3) "Hydroseeding" is this a machine that sprays the seed out with a chemical fertilizer of some kind? Also, I've found some diverse oppinions on "thatch". Is this a condition of over crowed dead growth on top of the ground? Or is it a crowded root systems? Or both? Thanks a bunch, really appreciate it!!!!!!