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This was a section of the small side of my front yard in 2019, before last summers reno. This was right in the heart of summer and I had not used fert for a while because I wasn't looking for it to grow a lot in the heat. Just posting this as a bit of a before, showing it wasn't THAT bad. I did reno on this section because it was prone to heat stress and this area specifically had a couple of patches that got fungus/disease every summer (later than this pic).
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That is what reno looked like. While it looks quite drastic, much of that is just dormant grass cut very short. I intentionally let it go to full dormant/dry, almost scalped it, and ran the electric dethatcher over it several times to remove the weakest grass. The hope was to leave behind the stronger established grass and clear out older weaker areas. Most of the dirt in this picture is actually covering seed. Some of the loose straw is also covering to help keep moisture in. I mean OF COURSE the f'n heat had to turn up after I started this. It was dry as fuck the entire time I was pushing this seed.
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Just one week later. Pushing water 4-5 times a day really woke up the dormant grass. Most of that yellow is still loose cover for the seed. Some seed has already emerged at this point.
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2 weeks later after the first mow (very tall). Lots of bare areas, but also quite a bit of new coming in.
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Two more weeks and it was nearly full. I did end up replanting a few patchy areas, not all of which ever did fill in fully last year, but aren't really visible at this angle and weren't bad. I hit those this spring and for some reason it took two weeks to even see any sprouts, but they are now filling in nicely. The color I have now is similar to this picture. I think it will be 1-2 more weeks before the color hits the point I want and I should be able to hold it there through to August at least.
As an aside, the neighbors yard you can see at the top of the last pic is basically dead. He's Ukrainian I believe. Nice guy, but he was trying to follow what I was doing last year because he liked my yard and thought he would try to do what I was doing, of course without asking questions. He dried off his yard and hit it with his dethatcher and I think even put seed down, but didn't water it. It's completely a waste land now lol. Hard as a rock. He's screwed.
I won't know how successful this project was until at least late summer this year, and really the full effect will come next year. One thing to keep in mind is grass doesn't entirely fully mature for more than one full year. It will continue to fill in thicker and grow more resilient into next spring. So far I can say the black beauty ultra (TTTF) came through the winter quite well and has responded this spring to minimal added product. I still need to get more potash down and probably another pH boost before the end of spring. Both were quite low and need two treatments to get right.