I use colored duct tape and just write on it with a sharpee pen. If the ink starts to fade, which I haven't had a problem with, you can just rewrite it.
The colored duct tape is easy to use and comes in all sorts of pleasing colors at Home Depot. I have blue, pink and red. I tape above each plant to the the concrete reinforcing wire that I use for support. ( I use it more like a long trellis or fence than cages). For smaller types of plants like lettuce or chard, I use bamboo skewers that you can buy in huge packs from the grocery store. Just take the tape and double it over itself.
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