When Carolyn Martus’s Plant Sale committee puts together signs for the Fall Plant Sale, they use a one-page informational sign per plant.
You've seen these: the row of plants sits in front of a metal stand with a printed page attached. The page has a photo and a description. See the sample below.
It even indicates whether the plant is in the rare plant list.
Did you know you can download these? Go to this page, then click on the plant you want to learn more about. The format is a handy PDF.
I think a three-ring binder of these, kept at your potting bench, would be a fun way to start on your cataloging efforts. There’s plenty of white space for your own notes, and the type size is quite large, so you can read it with ease.
And, if you are a photographer, and see a plant that has no photo, please feel free to take a shot and submit it for consideration to firstname.lastname@example.org - see your work published!