Janis, how does one grow Sternbergia in a greenhouse? I've killed several species in my greenhouse, and a type or two outdoors. Which is very frustrating, since Sternbergia lutea does quite well outdoors in the ground here in central Indiana, USDA cold zone 5.
I have had similar troubles with some of the miniature Narcissus species. Most do not thrive in my greenhouse, and only N. calcicola does really well outdoors in the rock garden. Too much summer heat and summer humidity, too much winter cold outdoors and not enough inside the greenhouse?
Jim