Friends, I was surprised that it wasn't pictured in the PBS wiki. I guess the plants are less than ornamental. From Google images, there seem to be a range of tuber colors and shapes. Are these really all the same species? Apparently a New Zealand cv called 'Red' or "Pink" Oca has close to round tubers and a waxy shine to them. Seems to be a dominant edible cv. Is this true. Other forms are rounded ovals, pointed 'carrot' shapes and in colors including yellow, orange and tan. I wonder how much variety there is in the plants from these different tubers. Liz, is Oca a year round crop or more seasonal? Thanks all. Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F +