Ancient Trees in San Diego
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The Moreton Bay Fig of Balboa Park
Moreton Bay Fig (Ficus macrophylla). about 112 years. Free, in the open park outside the Natural History Museum. The ground beneath its crown has been fenced off since 1989 to protect the tree's surface roots from foot traffic, but the tree itself is fully visible from the plaza.

The Kate Sessions Tipu Tree
Tipu Tree (Tipuana tipu). about a century old, planted in the 1920s. Free, on a public street corner. The tree and its California Historical Landmark plaque stand in the open on the northwest corner of Garnet Avenue and Pico Street.

The Guadalupe Island Cypress by the Horseshoe Club
Guadalupe Island Cypress (Cupressus guadalupensis). roughly 130 years, planted around 1892. Free, in the open park along Balboa Park's Sixth Avenue frontage, beside the public chess and horseshoe club building.

The Kauri by the Mingei Museum
Kauri (Agathis australis). not documented. Free, in the open plaza outside the Mingei International Museum. No admission needed to see the tree itself; the museum charges for entry to its galleries.