Castine is one of the few towns in the entire country where a large number of elms survive, many of which are over 150 years old.
The tour will begin at the oldest post office in the United States.
The event is free and open to the public, but pre-registration is requested.
Call the UMaine Extension office in Cumberland County at (800) 287-1471 (in Maine) or (207) 781-6099 before Monday, June 13 to register.
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