Oca seems to be a once a year crop sort of like potatoes and can be harvested after the tops die down. They keep for 2 or more months in the ground or as song as it takes them to sprout again. I've heard they taste better if allowed to sit in the sun a few days before eating. There doesn't seem to be much sun when they are harvested. You can learn more by reading a section in "Lost Crops of the Incas" online. Oca: http://books.nap.edu/openbook.php/… It's a fun book to read. CRFG(California Rare Fruit Growers) may have an information sheet. They aren't in the market now but may show up next month. Liz James Waddick wrote: > 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. >