Rick -- thanks so much for this advice. As it turned out, another one of the stems was also looking suspicious -- not quite as bad, but not completely normal -- so I yanked it too. Either both stems were from one bulb, or perhaps the original sick bulb has already fractured? That left three healthy looking stems. And, like I said, I started with three bulbs. Still haven't dug up the bulbs, but will do as you suggest when the blooms are finished. I've also emailed the vendor for advice. Will be interested to hear what they suggest. Thanks again! Laura