Need suggestions for landscape bed marker

Let me explain; I live in a condo where the association has a landscape service. When it's time to prune, they prune a bit more than I like (at least what I am used to doing when I had a home). I was told I could do my own, they would leave my area alone, but that would best be served with a permanent reminder although they would "put that on the list". I can come up with numerous ides on making a marker that I can write or put a permanent message on, just not one that will withstand rain and so on during the months I would keep the markers in the beds. I would be grateful for any suggestions. Sorry if this got a bit lengthy.
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