Toby Hemenway and Native Plants
A great monologue about "What is a Native plant?" with Toby Hemenway. In this case, he raises the questions of "Native to When?" and "What plants are you favoring by your decision?" or, to put it another way "What did you have for breakfast this morning?" Though only 6 minutes long, it raises some serious questions about our ecological footprint and how to best save native habitats.
If you are interested in a great book that discusses this topic in depth, check out David Theodoropoulos' Invasion Biology: Critique of a Pseudoscience