I am not a dahlia specialist but I always grow a few each year. I plant tubers with one eye and get plants consisting of one stem. But this year three of my plants are producing several stalks - as shown. I assume that the tubers had several eyes which I failed to perceive, but whatever the cause, I wonder what I should do now. It seems self-evident that each stalk requires a portion of the tuber's energy and so I should cut down all but the main one... although I suppose that more would grow to replace each one that I cut. Anyway, does anyone have a different idea?