Oct. 8, 2017
bluemink, Ageratum houstonianum
Most references call this bluemink, but I always knew it as ageratum. It is a common garden plant, often used for edging. It produces a chemical that inhibits reproduction in insects if the juveniles eat too much of it. It has become a troublesome weed in east Asia, Australasia, Africa, and Europe. Native to Central America, and now reported in AL, CT, FL, GA, HI, MA, NC, and SC. Beal Gardens, MSU, 9/14/12.