Common mullein is an herb that can grow 10 feet tall and adapts easily to a variety of soil conditions. A single plant can produce 100,000 to 180,000 seeds that can remain viable in the soil for up to 100 years, making mullein quite invasive and a serious ecological threat to meadows and forests.
About this Author
Elizabeth McNelis has been writing gardening, cooking, parenting, and homeschooling articles from her St. Petersburg urban homestead since 2006. Her work has appeared in “The Perspective,” a homeschooling newsletter distributed in Pinellas County, Fla., and on her blog entitled “Whatever!” McNelis holds a bachelor's degree in professional and technical writing from the University of South Florida.