I've used the mini blind and pencil method for over 10 years in seedlings. then in 2007, I bought a Brother Label P-Touch kind that uses the TZ label. I put those on all of my hybrids I bought in 2007 onto the metal label stands by Eon. I did about 250 in 2007 and they all stilll look new.
Last year and this year, I'm back to Mini blinds and pencils for lack of taking time to do more by the Brother label maker. Now, for some of my plants that I got in this year, I bought some address labels for my inkjet printer that are weather resistant. I bought these online and paid $60 for 3000 labels(100 sheets of 30). I printed out the labels from my PC and put them onto mini blinds and stuck them into the pots just like I had written on the labels. The first ones were put outside in March. They still look new today. Now, do not try this with just plain address labels because they will turn to mush and fall off. (Ask me how I know?
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I'll put the address of the company I bought them from in case anyone is interested. I think you can get the same labels for laser printers cheaper but I don't have a laser printer, so I had to pay more. At the time I bought these, it was the cheapest place I could find online and I spent many days searching for them.
www.onlinelabels.com
I too, have used the paint pens from Walmart and had good luck with them. I used them to mark on the contractors flags to number my rows years ago. The paint lasted, the flags did not! I also used them to write some of my labels on plastic cups and that too worked real good for baby seedlings.
So, there are many things to use, but I will say this and please think about it, do not use Sharpie's, they will not last on plastic. What doesn't rub off will fade in a short period of time. I cant give up my sharpies, I still use them to write on my seed bags.
Blessings, Mona