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Why the tree of heaven spreads so devilishly and harms Pa. forests

A former Penn State student, and current professor at West Virginia University, has figured out how "Alianthus altissima," or tree of heaven, an invasive species, has spread so much so fast: It has one strong sex drive.

The oldest known living Ailanthus is 124 years old and located adjacent to Chestnut Hill Community Centre on Germantown Avenue.
The oldest known living Ailanthus is 124 years old and located adjacent to Chestnut Hill Community Centre on Germantown Avenue.Read moreMatthew Kasson