We (and most other companies around here) run a string trimmer and no edger. Keeping one more piece of equipment on the trailer plus edger blades etc gets to be a pain when we can cut a good edge with a trimmer. It does take practice though. Also, its one less trip to the truck...trim everything and then edge it with the trimmer. It does add up.
With that said I am going to start keeping an edger on the truck and will edge most properties before the season gets underway. There's places where a trimmer just cannot handle the buildup. Plus it does leave a remarkably crisp edge.
High end commercial, multi-family and residential lawn care, irrigation (LI and BPAT), and landscaping.
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