>> Next year I plan to use cut up strips from milk jugs as markers.
I found a set of plastic mini-blinds that someone had thrown away. That was a 5-10-year supply of plant markers. I like 0.9 mm mechanical pencils for writing on them. And you can punch clean holes in them with a paper punch.
I found a set of CLEAN mini-blinds at a Habitat for Humanity Restore. Only $2-3! Now I have a 10-20 years supply, half of which are clean and bright white.