Doc is such a nuisance plant around here, and man when it sets seed watch out, thousands and thousands and thousands of seeds on a single seed stalk. And a tap root that I am sure reaches to China, so hard to dig out, and only knows, leave a hunk of root in the ground, the process begins all over. Doc, rats, can't stand the stuff. Nasty. Have a wonderful and beautiful day, love our life. Cindi