I got my start of Leucojum vernum from a friend in Wilton CT when we lived there. Strolling into her garden to see her "snowdrops" I was delighted to see that they were snowflakes, planted by some previous owner. We dug some then and there, in bloom, and I replanted them within hours. They did just fine in my oak woodland. I took some to NJ and planted them on the moderately high bank - meter or so above the bed of the drainage creek and they have continued to thrive. The soil is acid, and clay loam. I think moisture makes the difference. These bulbs do not appear to re-seed but over the last nine years they are bulking up through offsets. They bloom in spring about the same time as Galanthus nivalis, the green-tipped white bells making a nice partner for Helleborus niger. Judy Glattstein in New Jersey, where winter's iron grip and 16° Fahrenheit mornings have slammed the door on autumn.