I use the Brother P-touch label maker with different colored tape for the different types of plants. I order the colored tapes from Brother but the office supply stores carry the white tapes in several widths.
On the reverse side of the label is space to write info (with a pencil) such as re-pot date, flower date, or other info.
I color code mine like this - example
Paph - White
Phrag - orange
Phal - Yellow
Oncid Allaince - Blue
Vanda - Green
I place the printed tapes onto 1" X 6" labels. Note: Charleys has them on sale now for 50 pac -$3.40 regular price $6.95 (which is still cheaper than what I bought before)
Marilyn