The alu number tags seems a good idea...
I saw someone cut up an old soda can and scribe info onto it. No fading and cheap as dirt.I'll look around to what is cheap and durable and doesn't have to fly in from the other side of the world.
I use a sharpie on those white markers and half the label is always down in the dirt.Standard plastic plant markers. I use the P-Touch labeler which holds up outside for a LONG time - the two larger labels are over two years old and been outside until today. I don't want numbers and a file, just black and white that is not scribbled. Highly UV resistant.
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They also make colors with the same durability -
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Grimmy
I use a sharpie on those white markers and half the label is always down in the dirt.
That is SLICK.