Snow drops are a small white flower (see photo) that grows from a bulb. They are the first flowers to come up in the spring here (not indigenous, but I’m not sure where they come from originally). I guess they don’t grow everywhere. When I was living for awhile in Central Canada, I mentioned them to a friend, and he thought I’d made them up. One other place I know they do grow is Scotland, as http://www.craftygreenpoet.blogspot.com of Edinburgh recently posted some snowdrop haiku on her blog.