lawn and flower bed edging
I notice that landscapers don't seem to use any type of edging between the flower/shrub beds and the lawn. It looks like they dig a kind of narrow trench between the lawn and bed, I assume this keeps the grass roots from being able to spread into the bed. This seems preferable to some type of edging, for me anyway as I can never seem to get the edging material in a neat line. Is this something I should do, to dig a narrow trench between the grass and bed? Any suggestions are most appreciated.