Bud Blancher Knapweed

Day 292: If you're out walking and happen to see pretty little purple flowers which don't exactly fit the description of "thistle" because they're not thorny, or that remind you of Ragged Robin (if you have those in your area) or Bachelor's Buttons, step up and take a closer look. Chances are, it will be one of several species or hybrids in the Knapweed family, and a rapidly spreading invasive in many parts of North America. Even as a private citizen (as opposed to someone affiliated with an organization like the Invasive Plant Council), you can report your sighting on-line through EDDMapS at https://www.eddmaps.org/ and for those of you who have smarter phones than mine, there are apps to make the process easier. EDDMapS stands for "Early Detection and Distribution Mapping System." It is part of the University of Georgia's Center for Invasive Species and Ecosystem Health. Per their web page, "Early detection of new invasive species infestations and rapid, coordinated responses are needed to eradicate or contain invasions before they become too widespread and control becomes technically and financially impossible."

Knapweed is a growing concern here in the Pacific Northwest (unintended but appropriate pun, there). It can establish a monoculture in a very short period of time, and is sufficiently virulent to even give Scotch Broom a run for the money. Although many city, county and state agencies try to stay on top of it in their parks and on their trails, it goes without treatment on adjacent private properties. If you find it in a location where you can legally remove it, bag the heads before cutting, being careful not to shake loose any developing seed. Dislodged seed may continue to develop if it drops to the ground. Dispose of the bagged seed heads by placing them in your household garbage. Do not attempt to compost them; the temperature in a compost heap is not sufficient to destroy them. In worst-case scenarios, chemical treatment is recommended. Check with your local weed board to find out which chemicals can be used in your area.