I’d put a line of either brick or long concrete edging so u can easily mow over or use an edge cutter

Hi Chris, Depending on the area’s conditions (sunny vs shady), you could plant something like creeping thyme or moss that will spread and fill in the space.

Hi Elizabeth, if you have fabric underneath the gravel, then yes, you would have to cut if out where you want the plants to be dug in, so their roots can reach into the subsoil for nutrients and to become established.