Having taken out the lawn----I want plants to be the edging---but may use some plastic edging, and then try to grow the plants so they hide it. Some places need a short wire fence because I don't have all of the pathways done. Bark mulch is so far the new pathway, and also the bed is mulch too, so definitely need the fencing.
Eventually I will get stepping stones for pathways and then sow low growers along them. For-get-me-Nots in shade area paths. Dwarf sun plants along other paths.