Our sunroots haven't come up yet and I'm actually worrying about them quite a bit. Usually by now they would be up and about but so far I've seen no sign of them at all. So, Marilyn, you can pass on this spring.
I've dug around and found tiny little roots so I think they are alive but I don't have any big roots at all this year.
Carol, if you really wanted to do some experiments (and I highly recommend you do!) I would highly recommend you splurge and order a pound from Fedco's Moose Tubers. That's where I got mine and they were nice and big and healthy. If I had them I'd be more than glad to send you a box but as it is I think mine are barely surviving. I'm going to try a different location for them this year, somewhere with the soil not as heavy with clay.