For centuries, human activity has intentionally or unintentionally driven the spread of plant species to areas far outside their native habitat. On average, about 10 percent of non-native species ...

This might be a little controversial, but it’s been on my mind for a while. I was recently sitting in my backyard with my friend Mackenzie beneath the coverage of the 200+ trees that surround my home.

Q. I heard that we shouldn’t plant a tree of heaven because it’s invasive and host to some invasive pest species. Could you explain? The tree of heaven (Ailanthus altissima) is native to China but has ...