Neat planting bed edges give any garden that wow factor. Neaten edges with a fresh cut or scoop out any accumulated soil or mulch.
Keep edges weeded and grass-free. Sprinkle a per-emergent herbicide like Preen into edges to suppress weed seed germination. Raised garden beds make edge maintenance a non-issue, and if you’re not inclined to fuss over edges, they’re probably the way to go.