I promised that I'd report back on the pesky horseweed (Conyza canadensis), which went to heaven last night. We got out the tape measure, just out of curiosity. As you can see, from root to top tip, the horseweed measured 101 inches! That computes to more than 8 feet long! And the root was immense.
In the meantime, Austin garden blogger Deb Wilson emailed me yesterday about her horseweed and related post, "Why try?" She was running a similar experiment with horseweed in her garden. In retrospect, I like her idea about putting the blooms in a vase. Too late over here for that! :-)