You could donate it to the museum of players, run by Deadbob. It's a house completely filled with stuff from players who have helped shape UO over the games history. Statues, books, roses etc. Deadbob has been missing for a few weeks so contacting him may be a slight issue, but you could always drop it in the mailbox at his museum (I have a house teleporter to it located at my in town luna house at the south luna crossroads).
Alternatively, Goodman's rune library might collect stuff like that from old players. Andrasta is the owner of it.
Assuming the rose is on Atlantic of course, which the screenshot seems to suggest it is.