I have a push mower (two wheels on the front and two on the back). When I mow around my circular pine or mulch islands 1 2, a wheel inevitably falls into the island and buzzes my grass, leaving streaks of brown. I like keeping the grass pretty short if I can. I have resorted to using a weed eater to trim the grass around the islands, but it is hard work. Any tips (ideally not requiring a new mower)?
You can see the brown streak in the top image 1.