Posted: 19/07/2013 at 15:50
Hello Amy, Do you mean a Canna lily? I cannot find any reference to a Cala lily in my books. Is this lily in a pot? It sounds like the bulb has gone rotten. Have a look at it. You may find vine weevils are the culprit or the lily beetle lavae. The vine weevil grubs eat the roots and the lily beetle grubs eat the foliage, flowers and seed pods. If the bulb is massively overwatered I suppose it would go soggy. I hope you find an answer to this problem!