The rock and driftwood idea is good to jog the memory so we can check up on the progress of a new addition.
Vickie - my husband cut 8 to 10" lengths of cedar and that worked for markers for many years. They far outperformed the metal stakes with sharp edges that always managed to slash my ankles. The metal ones with rounded tops were better but still resulted in the dreaded "graveyard" look. Many years ago I decided on beach stones and a Sharpie. Even though they fade out and need a touch-up every few years, they look nicer than any other markers I've ever seen.
1. Japanese iris 'Japanese Pinwheel'
2. Japanese iris 'Innocence' will need doing over by next year - that will be four years from the original Sharpie writing.
3. Japanese iris 'Variegata' - the photo at the left was taken four years ago when I had just done the writing again, but at the right you can see how it has faded and could use rewriting. I carry the Sharpie in my tool basket so as I cut back the plants I use it.