So instead I decided to do a little arts and crafts! After a bit of brainstorming on the materials to use, I ended up choosing an empty juice carton box and some plastic forks (We have a big Costco box of them that rarely gets used).
I am highly pleased with my final product :D I made them big enough so I can even write down the specific type of whatever plant. I also cut up a bunch of thin skinny pieces for labeling starters. Everything's written/drawn in permanent ink so they don't wash off and if I lose them they really won't be that big of a loss.
One carton made enough signs but I'll probably start saving and cutting them up for future use as well.