I have a large bulb of Pancratium maritimum which we found lying on the surface of the sands last year at the beach at Xerocambos in Southern Crete. I brought it home with me to draw and paint in all its growth stages, so I potted it up on the surface of local sand from the beach. It didn't do well, so I removed it to draw and then left it in my studio. This Autumn I noticed that it was producing a shoot, so I have now repotted it in a deep, narrow terracotta pot once again in sand from the beach where the plants grow. This time I planted it fairly deeply - up to the neck of the bulb. The new shoot has died off and it isn't producing any new growth. Someone please help!!!! I really want this bulb to do well. I keep the pot on our roof terrace which faces east...is this the problem?