Last year on this forum, I asked about what people did in regard to labeling for plant sales. I did find a good solution - a program from Gardenware. They offer a 7500 plant database; I have had to add quite a few types of plants, but after all they are aiming at commercial nurseries while we offer plants not seen as often in commercial outlets. They claim that the labels, printed on a laser printer, resist rain and UV for 3 years. I use the 1-inch potsticks, which I also buy from that company; it works out to 5 cents a label, when you add in the cost of the ink.

I am not connected to Gardenware except as a customer, but I have been happy with the product and with their customer assistance (which I needed to call only twice!).