I bought a lotus once that had a nice big bulb, with roots and leaves growing out of the top. When I was replanting it once, the top part (roots and stems) broke cleanly off the bulb. I tried replanting the bulb and the top seperately. At first the top sent out a few new leaves and I thought it would live, but then it stopped growing and I eventually threw it out. Maybe it would have started up again if I'd given it a chance, but I thought it was broken. Meanwhile, the bulb didn't do anything, and so I thought it too was dead until about eight months later, I discover some lotus leaves coming up in the area of the forgotten bulb.