Does anyone have any insight into why the Cardiocrinum giganteum bulbs I planted rotted soon thereafter? The first time, I planted a big healthy-looking bulb in a large clay pot, with good potting soil, and it grew nicely for a while, then died. The bulb was totally rotten. The second time, I planted three healthy bulbs in an undisturbed hardwood patch with partial sun. All three grew well for 2 months, then rotted and died. It's possible I overwatered the first bulb, but we've had a dry summer and I didn't think the other three were likely to rot. Any ideas?