The Duffie Oak is a historic Southern live oak in Mobile, Alabama. Being approximately 300 years old, it is considered by scholars to be the oldest living landmark in the city. It was originally known as the Seven Sisters Oak for its number of large limbs. It was later renamed for former mayor of Mobile George A. Duffie, who lived nearby.
The tree has a circumference at breast height (CBH) of 30 feet 11 inches (9.42 m), a height of 48 feet (15 m) and a limb spread of 126 feet (38 m). It was recognized by the National Arborist Association in 1977. The Alabama Forestry Commission recognized it as a famous and historic tree in 2003.
- Borland, Timothy (July 22, 2011). "Treehugger 4: Duffie Live Oak". Mobile Bay Magazine. PMT Publishing. Retrieved November 13, 2012.
- "Notes on Mobile Bay Wildlife". Mod Mobilian. Retrieved November 13, 2012.
- "Alabama's Famous & Historic Tree Program" (PDF). Alabama Forestry Commission. State of Alabama. Retrieved November 13, 2012.
- "Live Oak Project, Mobile, AL". Native Tree Society. Eastern Native Tree Society. Retrieved November 13, 2012.
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