I don't know of any, but most inkjet inks are water-soluble, so they
will soon become illegible. Make sure the ink you are using will
withstand watering. Also, prolonged exposure to sunlight will fade most
inks, particularly the greens, leaving you with discolored purple images
(assuming you want color images on your tags). Laser printers do not
share the water solubility problem as far as I know, but they share the
fading problem. The commercially produced tags are much more resistant
to fading than any of the printer inks I've come across (although I
haven't been specifically looking for fade-resistant inks).
If you are looking for a large quantity, there are manufacturers who
will make custom labels. If you are looking for a few houseplant labels,
you can try putting clear tape over the image to protect it from water.
If it fades you can make a new one. (You might make two or three tags of
each one and store the spares in a dark place so they won't fade). I
find that the tape method is labor-intensive and not 100% reliable (more
like 70% over a month or so [very rough estimate]), but for only a few
labels you can probably live with it.
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