I also use old cut-up blinds and love them. They are easy to see and read. I
also plant regular labels under the dirt because some critter loves to steal
tags.
I use pencil and waterproof ink on front and back of labels. The pencil
lasts longer outside, but they are about the same inside the plant room.
I have also started using a white permanent marker on the outside of my
pots. I learned to do this when taking plants to a local garden sale. It is
easier for shoppers to see what they are getting.
Marguerite - Descanso California, alt, 3500 feet in the foothills east of
San Diego
My current favorites are the Irises, which have been
blooming
mightily despite winter's continuation and seemingly
gallons of rain!