I saw several of these, all leaning (some quite a bit), so we probably
want to put them in pretty deep, and maybe even in Quikrete to make
removal harder. We have a post hole digger in our shed, though those
don't always go very deep.
Looks like aluminum posts with a sticker applied.
Just a thought on wording:
Property of OHAC (or AAPS)
No Unauthorized Planting or Plant Removal
Maybe a logo and/or a permanent email (OHAC pres or TNC chair or steward).
Jim Vallem
734-358-0336