Ancient Trees in Ferrara
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The Gray Poplar of Palazzo dei Diamanti
Gray Poplar (Populus canescens). over 150 years. Free, in the palace garden, generally open with the palace's own hours; check before visiting

The Bagolaro of Parco Massari
Mediterranean Hackberry (Celtis australis). about 150 years. Free, public park, open daily

The Ginkgo of Parco Massari
Ginkgo (Ginkgo biloba). over a century. Free, public park, open daily

The Ginkgo of the Biblioteca Ariostea
Ginkgo (Ginkgo biloba). over 130 years. Free, in the library's public courtyard garden, open during library hours

The Plane of Viale Po
London Plane (Platanus x acerifolia). not individually documented. Free, on the public street, no gate or opening hours