7. Chinese Tallow
We have none other than Benjamin Franklin to thank for Chinese Tallow, also known as Florida Aspen or more colorfully as the Gray Popcorn tree. It grows profusely in ditches and dikes from South Carolina through the entire Gulf Coast. Though trees aren’t usually thought of as weeds, the Chinese Tallow is in a class by itself: considered a noxious invader in the U.S., it joins algae and palm oil among the top three vegetable oil crops.
Image and background information: BaylorBear78 on flickr.com.