May I ask if the lawn you'll be re-seeding is in full sun, part sun shade, or full shade?

I'll look into that, thanks hyacin.

Joe, the lawn is mostly full sun. Maybe 20-30% gets some shade in the late afternoon/early evening.

Hate to say it, but you have caught the bug. Prediction: same time next year you will be saying you are not happy with the results of the overseed and will be asking the forum to critique your plan for full scale renovation.

No worries, I appreciate all opinions.

So, as in I'll do more harm than good? I have overseeded twice in the past and have been relatively happy. I just want to go big time and actually introduce an aggressive, elite cultivar.

i will tell you that in a relatively healthy lawn, overseeding with elite cultivars is really low yield. KBG has such long germination time and low seedlings vigor that most of your seed will be wasted. core aeration is not a meaningful turf prep when it comes to KBG overseeding.

btw, how big is your lawn? You wrote 2000K.... K usually means 1000 sq ft.

Understood. That's why I want to scalp as low as I can tolerate and use PGR. I hear you though. I'm not excited to waste time and money.

And yes K as in thousand. My bad...that's a huge yard, lol. I am 2000 sq ft.

2K is so small that you'd be crazy not to nuke the whole thing and get the results you demand.

IMHO, PGR use in overseeding is not helpful. what happens in 30 days when the effect wears off? ...rebound growth surge. if you reapply, it also stunts your seedlings which are probably strands of hair at that point.

If you've never scalped a lawn--especially a thick lawn--you have no idea what you are in for. extremely difficult and time consuming.

Have courage and just do it or youll just be doing it next year.

Courage...that's the tough part. Got me thinking, though.

everyone that has renovated on here has probably built that courage through several unsatisfactory overseeds and years of doing proper lawn care only to get mediocre results. not sure what your irrigation options are but it sounds like you are capable of pulling this off otherwise.

+1 on full renovation. You'll regret not doing it. It's not that much harder than overseeding,

i would argue that it is less work but greater cost. you certainly will worry about it the minute you finish spraying roundup until probably next spring.