zone 6-7 NJ. 2 Falls ago, a %100 KBG sod lawn was overseeded because a lot died from over watering the year or two after install. That first seeding (middle of September nice and early but not too early), I used Outside Pride brand Midnight (midnight cultivar) which isn't certified but I gave it a shot, germination was really good so I'm not knocking that brand but then the following Spring it was as if nothing made it. I'm thinking it was still at the sprout and pout stage the following Spring and possibly killed by over-watering because the roots are so small and easily blocked of oxygen if over watered? Then, last Fall (2019 like 7 months ago) I tried %100 KBG again with a more expensive KBG certified blend from seedsuperstore. This: https://www.seedsuperstore.com/catalog/p-100006/ss1100-bluegrass-blend I think they recently switched out the Midnight with Bluebank,so I planted Blue Note, Bewitched, and Midnight which are all supposed to be great choices for this zone. I know midnight is late to green up in Spring, but the others not so much, yes it has been cold but many fescue lawns have needed to be cut at least twice so this year, and the seedlings of this KBG are Still only tiny 1/2-1" sprouts, and it's in full sun, I do see some tillering though which is good. Both times it was given starter fertilizer when seeded. This past Winter it only snowed a few times and was only a few inches that melted right away. I thought maybe snow mold killed the first attempt but probably not and I'm not sure why that outside pride never made it - I know certified guarantees to be the cultivar advertised, and certified weed-free amount, but even without the certification I know what I saw was KBG so either way something should have grown, and outside pride doesn't seem like some BS brand to like sell contaminated seeds or something, so I think over-watering in Spring killed the first overseeding attempt. I believe it was set at 1 hour once per week starting around mid April. That time also it was fertilized in early spring either with synthetic and/or milorganite. And then again like 6 weeks later. Both times were prepped to a t : cut and bagged on lowest setting, lightly tine dethatched, bagged, double/triple core aerated, seed and fert spread, worked in seed, had sprinklers set correctly to germinate and then taper off. About a month ago in early April/late March this second attempt using seed super store it was given pre emergent. About 2-3 weeks ago it was given a Very light scattering of synthetic nitrogen and potash - very light in case the grass isn't ready to actually use any of it. And watered-in, always watered-in. Yesterday it was given a normal dose of synthetic N-P-K and a very light amount of milorganite. The plan is to just use synthetic to get it boosted quickly and then only needs milorganite unless P-K tests show deficiency and would be addressed (or just use winterizer for the K and a little starter for the P without doing soil tests). Anyway, I read people say fertilizing during sprout and pout could be a waste but it's been Spring for a month in full sun and it's still like it looked last October. Sprout and pout was supposed to be over by the end of last Fall usuaully. So do you let off on the watering for a few more weeks for it to get warmer? Otherwise it may drown the small roots if water now? It has been raining a lot but the sprinklers aren't turned on yet. Once irrigation starts am planning for 1 hour once per week and then in summer heat will up it to about 2 hours once per week, rains counts towards this. Give it a even more synthetic nitro in a few weeks? I hear people doing rather heavy rates of nitro on new seedings, but KBG is quite different than TTTF of course - it obviously focuses on rooting and eventually rhizomes before it even grows blades like TTTF does. Phosphorus should be good and I wouldn't put more unless a soil tests indicates. Since the top growth is so slow, does that mean the roots are too though? Once it gets warmer and you suggest to start the irrigation, should any sort of kelp or anti fungal product be used to hinder the chances of fungal disease? Other than that, I'm suggesting it be mowed on a higher setting than the usual ~2-3" which will help the lawn in many ways (if it even grows!). And also suggested mulching instead of bagging but now I'm thinking mulching before establishment might increase the chance of fungal problems due to clippings left on lawn reduces aeration of the turf (even with a gator blade and mowed at least once a week possibly more?). thoughts and suggestions please. thank you.