For those who are unaware of this phenomena, the first tree sprout appeared in the early 1870s and its descendant presently grows majestically from an opening in the tower. Historical details are available at this "website". Pay special attention to the last paragraph where it describes the theory as to how the tree is watered! ;>
The square is amazing. It is two or three times the size of Lebanon's square and FULL of businesses. Yes, you have offices of attorneys and title companies, but there were craft supply stores, hardware stores, etc. that were BUSY! It seems rare nowadays to have the traditional courthouse square that is ALIVE. Some day, I would like to return just to shop.
I located his email address and wrote him to inquire the origin of the Erdmann family. He was wonderful! Immediately, he compiled some photocopies of obituaries of the Erdmann family revealing that Charles Erdmann was originally from Switzerland and came to Greensburg from Cincinnati. He opened a cigar factory that was called C. E. Erdmann & Sons. One of the sons was George E. Erdmann whose name is featured on the building that hosted their business. George's son, Morris, moved to Hammond, Indiana and I can't help but wonder if Ed's family originated from there. We'll definitely have to pursue it one day.
If time allows, always be willing to turn off the main road to see where a road less traveled may take you!