Ok, I usually cut my grass between 3-3.5" I decided to raise it to 4" last week due to me being out of town and missing my every third day mow. I have a perennial rye/Kentucky blue mix on my yard and noticed after I mowed that the flowers or seedlings from the grass were still showing. I figured this was due to the excessive growth and that the next time I mowed at 4" I'd cut it down. Well, I just mowed it again today and they are still there. I don't like the way it looks at all as the "whiteness" from the flowers makes the lawn look like a lighter shade of green. I'm planning on dropping back down to 3 or 3.5 but I was curious if 4" is too high for my grass type?? Anyone have input?