Have you tried the P-Touch Extra Strength Adhesive Labels with the P-Touch label maker? For the first plants we put in at this house (about six years ago), I also used the Avery Labels with my laser printer. But, a friend with a local gardening group told me about the P-Touch labels, and so I gave them a try. I liked them better because I could easily pop out just one label as each plant was added to the garden. I started using the P-Touch about five years ago, and I haven't had to replace a label yet, even in the rose garden with full sun and Louisiana heat/humidity. None have faded or even cracked.

I got a different brand of label machine 5 or so years ago, similar to the P Touch, and I really loved it just for the reason you described... but the labels started fading after just a year or two (very sunny yard). Now I just stick with the Avery labels... sometimes I'll make temporary labels with Industrial Sharpie until I get around to formatting a page of laser labels...

You can run the same page of labels through the printer several times, printing out however many you need... just leave the areas blank where you've already used labels from that page.