I got them from one of mamajack's co-ops a couple years ago. Nothing seems to damage them or the labels. What Chris does is also a great way to do plant tags, and less costly now that I can't get them through a co-op.
http://everlastlabel.com/
http://www.gemplers.com/produc...
http://www.bountifulgardens.or...
This one is interesting:
http://www.yuccado.com/doohick...
These are the ones I have:
http://www.metalgardenmarkers....
And I use the P-touch label maker with the labels that have the extra strength adhesive for harsh environments. None of the labels have come undone.
Here is the new photo of Olivette. Yours is more yellow, but that can be due to your soil retaining more moisture than my fast draining raised beds. Time will tell.