After doing some experimenting on my own lawn, it seems best to cut mine at 3-3/4".
First thing was to ensure that the deck height adjustment was correct. Also ensure the blades are level from left to right. There may be different opinions about the pitch of the deck but my Ferris is set with a minimal pitch of about 1/8".
last summer the cutting height was set to 4" looking to get maximum root depth. I mowed when the grass grew to a max of 4-3/4". What I noticed was some varieties of grass would lay over and not look as well.
this year stated out early spring with a 3" cutting height keeping it shorter to allow a little more sun light to warm the soil. Eventually found that cutting the grass to 3-3/4" (maximum growing height of 4-1/2"-4-3/4" made the grass stand tall without laying over.
The taller grass (with hopefully deeper roots) didn't seem to help the lawn from going dormant in the hot dry July/August time frame.
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