I wanted to re-spark this thread as i said I would back in February! I have to admit that i didnt try every clever method listed in this wonderful thread. I did however try quite a few and have some documentation to show after a long season here in michigan. We dont have the best of weather so I feel like this is a nice test! I wont be showing every picture of different combinations, but this will still give you a general idea. The tags were created in March, went into the ground outdoors in April and were just pulled out today (almost november).
The clear winner in my opinion was plant tags and grease pencils! I believe catchthebear was the first to mention this in the thread and others backed him up on it. I too have to agree. They weathered so well that I could definitely reuse next year again if i wanted to with zero concern.
Noteworthy mentions: I can see a great benefit with using copper tags as one member mentioned for long term/favorite staple varieties. I can also see using cut pieces of blinds working great but I didn't try that.
I saw basically no difference between milwaukee inkzall and a standard sharpie.
wrap around tags are great if you want to go around a plant, but dont attempt to use them as a standard "stake" style tag lol
Forks work REALLY well for staying in the ground, but arent as easy to write on due to size.
Your results may vary, but again for me the easy winner in my testing was GREASE PENCILS and standard "stake" tags.
Some documented Pictures:
Winner (grease pencil and standard tag)
Milwaukee Inkzall marker and fork
Sharpie and fork
wrap around tag and grease pencil