I'm just concerned about the little seedlings will they catch up to the other new grass? Yes! Maturity time is 45 to 90 days (getting later, closer to 90, so it won't finish that out until spring as the clock stops in winter. Mostly, anyway). The paint-can sized areas will fill in and catch up, and thin isn't blank. They're just slow. You can fertilize now if you want. What to use depends on your soil. If soil tests show you were short on something, make sure to add a little of it again now--you probably didn't add it at the time of planting. If you don't have soil test results, you can certainly use either organics (a bit late for that, but still functional here in PA) or synthetics (TurfBuilder, whatever, but don't use ANYTHING with weed killer in it!). For very young grass, I tend to be conservative and feed at half the rate, slightly less than twice as often. Once they mature, you can step up to full feedings, but I find they seem to do better if you don't shock them all at once and keep smaller amounts of food constantly flowing in.

I agree with the fertilization. You may also be watering too much as the requirement is greatly reduced in cooler weather. In any case, yellowing at the 28 day mark is not a good sign. Any signs of fungus?

Trina Merry, body painting. http://www.trinamerryartist.com/astrology-series/

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