Hi. Last winter I tried overwintering my lotus tubers inside, but they all died. This last fall, after the plants died down, I left them all in their pots and submerged them in a friend's pond. Do I need to divide up and replant the tubers before I see any sign of leaves coming to the surface? I know I'm supposed to avoid breaking off little shoots, or the tuber dies, right? When should I divide and replant? The last official frost date in central Ohio is May 15, if that means anything.
Thanks.