Looking for good, permanent plant label options

As my perennial garden grows, I'd really like to have permanent labels outside to help me, and anyone who might want to come by and look. I will have progressing memory issues and it's just a nice little extra thing for myself and whomever inherits the garden.

Even for my annuals none of my markers last the year. I've got new ones this year I'm going to try where I've painted, polyurethaned, will write the name, and then polyurethane again. I still don't think they'll last too long though.

I'd prefer something I can make myself, but I'm open to suggestions otherwise if there's a company that makes what I'm looking for. Has to be able to survive Ohio weather, so hard freezes and hot summers.