I use mini blind slats and a sharpie. Nancy

Aluminum pop cans cut into strips. Easy and fast. Cut them length wise of the can and just bend them over the wire of the cage. Write hard on the unpainted side with ball point pen and the indentations make it permanent.

Personally I never saw any problem with the flapping in the breeze as it deters birds and other garden pests.

Dave

No matter what I use, the printing always fades away in the fierce sun. Including sharpie, permanent marker, all of them.

Ernie, Try the Industrial Sharpie. It holds up well in UV light. I used it last summer and it was amazing...no faded tags. Tags marked with regular Sharpies always fade and sometimes are pretty much faded completely away in a few months. I found these at a local office supply store. A pack of 3 cost me a few dollars. I'll never use the regular ones for plant tags again.

Here is a link that might be useful: Industrial Sharpie

When in HD or Lowes, go to drapes/blinds section. Sometimes they have bucket full of piece trimmed off customers' special size. They are usually wider nowadays. So you can cut them into 3 or 4 strips. Then use a permanent marker. You are set.

Other option is popsickl sticks. They are cheap but don't weather good.

I use dymo, the really old one that embosses (sp.) letters on plastic tape, this has one sticky side. Then stick it on either wood stake-popsickle-metal stake-piece of blind-or hang it (after adhering to a piece cut off coke/pop can), depends what I am marking.
(I have the gizmo from way back when we used it to make labels for storage in banker's boxes).
One can buy dymo embosser that works on metal I think, but it is more $$$.

Rina

I'll continue to use popsicle sticks in spite of their one-season lifespan, because I get double enjoyment from them: first, the cold sweet treat on a hot summer day, and second, the following springtime, the plant marker.

Carol

With the mini-blinds, write with a pencil. It never fades and is legible years later.