I have been using that rubbery stretchy surveyors tape that comes in bright colors. I use pink, neon yellow or orange. I just hold the roll and pull off enough to tie with and write on the roll the variety and the date set out then cut or tear off that piece and tie it to something at eye level. I use a sharpie marker and it usually fades some by the end of the season but if the plant lasts long enough I can just make another and tie it on to replace the faded one. It does look a little like a used car lot with all the little ribbons of tape blowing in the wind. The thing I like the most is the ease of doing this and the cost which is next to nothing. Below is a picture of my trellis with markers tied on.
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