David, maybe we could swap Heliathhus tubers? Mine are not red, but yellowish. I grow them here in my garden in Norway, where they are doing very well, maybe more so than we really need.
I never thought about trying them in Greece, maybe I should? I never watered them here; actually, the only work I do with these is to dig them out when they spread too much, and harvest them, either in the autumn or in spring. This year I could probably harvest them now in February as well, since we have had no winter yet, no snow and hardly any frost. If the climate change continues in this direction, Norway will soon have a Mediterranean climate as well.