I saw a blog on another lawn care forum where the admin asked, and answered this question. "Should you trim before or after you mow?" Sadly, he answered it wrongly in my opinion. He thinks you should trim BEFORE you mow for various reasons. One of them is that he thinks trimming after you mow could leave tall grass on the border of everything. I disagree. I trim after I mow because the mower is what sets the height of the lawn's grass. The mowed grass's height will be the predominate height, and if you trim before you mow you have to guess what that's going to be, whereas if you trim after you mow, you have a guidleline for how much to trim. Additionally, trimming before you mow leads to a high probability that you will trim more grass as you're walking behind a trimmer, which takes time because even the best trimmers go slower trimming than when mowing. But that's what I think - What do you guys think? Side question - I trim after I mow, but I edge first. I edge first because all the mess that is left behind the edger is generally dispersed when I come over it with the mower which makes blowoff time a lot easier, especially if I'm bagging that yard. Agree or disagree? Thanks! Doug Creations Lawn Care, LLC. Exmark Phazer ZTR Echo Trimmers, Blowers, Edgers 2008 Ford F-150 SuperCrew Creations Lawn Care, LLC. "...Going the Extra Yard"