I didn't know they had potatoes but I was working around them and noticed something sticking out of the ground co I looked closer and dug up 2 large potatoes.Now, are they edible? Do you start new plants from the eyes like a regular potato? If not then how? I had lots of these plants last year but never pulled one up so I didn't know they had potatoes or maybe it would be called a bulb.If I can keep these over winter then I won't have to buy new plants every spring.Question is,how do I keep these over winter? Thank you for your help.