Tree Quercus falcata [Southern Red Oak] Generally only hardy up to zone 6, this oak is native to southeastern regions of the United States, but can sometimes be grown in colder climates. This tree gained its specific epithet name, "falcata", from the sickle-like weapon of the same name, in reference to the sickle-shaped lobes of the leaves. Root disturbance is known to severely affect this species, and can lead to decline or death.