Would you pay $550 for a single snowdrop bulb? What about $2,500? If you say yes, you may be exhibiting signs of what some people are calling galanthomania—an obsession with Galanthus, or snowdrops.

It’s almost bulb-planting season, and to celebrate, I thought I’d put the spotlight on one of the most popular spring flowers: the snowdrop. More specifically, the prettiest snowdrop varieties money ...