A yard without trees is like a cup of coffee without creamer -- functional, sure, but missing some key element that makes its ...

American Elm Species - 4.0 Growth Factor X diameter; Ironwood Species ... For old to ancient trees, significantly increase the Growth Rate Factor. Sources and Further Information .

However, almost all mature American elm trees have been killed in the last 50 years by Dutch elm disease, which is caused by a fungus, Ophiostoma novo-ulmi, introduced from Asia. Elm bark beetles ...