 Why should we increase their abundance? I do promote goldenrod. I don't promote ragweed. Goldenrod does not make us sneeze at all. It has very heavy, sticky pollen. We blame goldenrod on what ragweed does. Ragweed has very light pollen. That's what people are allergic to. Now, ragweed does support a lot of insects, but having spent the first 20 years of my life sneezing my head off...