In response to this. I bought and grew a collection of wild chicories from Territorial Seeds. Tremendously vigorous plants, with all the leaf hues from lime to maroon, and they provided modest radicchio-like heads in the fall (they needed to be cut a couple of times before they headed). Radicchio is tamed chicory. They provided again some greens (reds) in April, and I let them go to seed in the summer. I collected the seeds (about two pounds), which then I used on a patch of clay soil I had brought in to fill a hole in my backyard. They broke the ground nicely (they have dandelion-like taproots), and now I toss some seeds in out-of-the way parts of my backyard for some bitter greens and also because my daughter guinea pigs will eat nothing else if they can get chicory. Fun plant to grow, and free veggies for all at this point.