Ceres: Time to archive this cache.
Originally it lay under a small tree, but the tree died leaving the cache with no significant landmark nearby. Now that the vegetation has grown thick with all the recent rain the cache is almost impossible to locate. I couldn't find it today.
Revising the puzzle to point to a new location would be a major task: as I found out when I set up the puzzle there are only a limited number of solutions of a puzzle with this theme, and very few of those lie on public land.