I've lost so many IDs since moving to the U.P. Keweenaw Peninsula. We have lake effect snow here, normally 200+ inches with about a 30-36" snow cover at any given time through the winter months (usually December - April).
I have trouble with permanent markers fading out and my p-touch labels don't last more then a winter or so, if that. I do have some out there now, where I put the p-touch label on the metal marker then sprayed with several coats of clear spray paint finish (drying well between each) that is supposedly weather proof. Those have made it through the first winter ok, so now I'm waiting to see how they hold up longer term.
What plant tags hold up best for you, under extreme snowy conditions?