Hallo Sarah, Cardoon looks like a thistle but is a vegetable. It is big and takes a lot of space to grow. I never have grown it myself but I have seen it with friends. It can be nearly 2 mtr. tall. It needs lots and lots of water in the summer and in the early autumn you have to earth it up, I believe, thats for reducing the stringiness of stalks. The top looks like an artichoke. You eat the stems. Cook them for half an hour, cut in small pieces. I don't know if it tast good.