I am trying to grow 4 bulbs of Hippeastrum roseum. The bulbs of this dwarf plant are golf ball sized. After weeks of waiting, two of them started to produce leaves, which promptly withered to brown and now black. The bulbs seem firm, but have no roots. The leaves only grew a few millimeters before dying. The bulbs arrived during a severe cold snap. They were outdoors for at least 8 hours in freezing temperatures (if I remember it got as cold as 10 deg F that day). I'm not sure if these bulbs were effectively DOA, or if I'm doing something else wrong (i.e. over-watering) that is killing them off. At any rate, I have two more that might survive. I'm tempted to unpot them and store them a couple months in a cool dry dark place. Do you guys have any other suggestions? Other varieties of Hippeastrums that arrived in the same package are sending up flower stalks... and others are still totally dormant. It's a bit perplexing.