This year I've been running an experiment to see which type of pen lasts the longest for labeling plants outdoors. I have compiled links to the previous posts and added pictures from each month where I hadn't already posted them. Results: Sharpie Oil Pen lasted longest, Craft Smart Oil Pen was still legible at the end of the year, and Sharpie Permanent Marker faded very fast. If you're labeling plants outdoors, buy an oil paint pen, preferably Sharpie.  If you want to test how colorfast or fugitive your journal inks are, you can run the same kind of test indoors on paper that is in a window with sunlight.

These are the other posts regarding the labels.
1/3/25 Photos: Testing Pens on Plant Labels
2/3/25 Photos: House Yard and South Lot
3/3/25 Photos: House Yard and South Lot
4/4/25 Photos: South Lot
5/6/25 Photos: South Lot
6/2/25 Photos: House Yard
11/3/25 Photos: Lantern Terrarium Assembly Part 2 Testing the Fit (labels at bottom)
Photos: House Yard 12-16-25

( Let's do science to it... )