The ithian tree is a plant lifeform, a long-lived deciduous tree with coppery leaves, native to the planet Cardassia Prime.
Ithian trees grew in forests. (PIC episode: "Penance")
History and specifics
They were planted along streets in rich sectors of Cardassia City such as Coranum and Paldar. (DS9 novel: The Never-Ending Sacrifice)
Red leaf tea was derived from the ithian tree. (ST reference: The Star Trek Cookbook)