I usually associate it with an unusually warm and sunny winter day but on Monday it was snowing in Seattle: soft, clumpy flakes drifting down from the sky on and off all day long, leaving a frosting of white on the grass and car windows.
Still when I left work that afternoon, I passed through a zone of piercing sweet scent that I immediately recognized as sweet box (sarcococcus humilis, I believe, though I am a little confused by my sarococcus species).
The scent is hard to describe but almost everyone describes it as piercing. For instance, I found this blog post by Barbara Wilde who gardens in Paris and found it wafting out of Parc Monceau. She describes it as powerful and piercingly sweet.
Another common description, and one I have used in the past, is the sensation of being stopped in your tracks, as described by Sue Taylor in an article at Dave’s Garden. She compares the scent to honey.
This year my first thought was of violets. Mary Robson at Muck About describes it as vanilla and honey. She brings in branches in November and “forces’ them to bloom indoors.
I have tried this myself as a way to extend this delicious scent but the scent really loses its charm after a few hours in a warm house and becomes cloying. I prefer that elusive, piercing, evasive scent that surprises me on a winter day with its promise of spring.