Nothing. I currently have a daphne odora that looks just like all the others only it has no scent. I can detect a faint scent if I stick my nose right in a blossom. This is so different from my others, which perfume the whole yard.

I also wonder if the time of bloom this year has something to do with it. I'm used to the daphne's blooming in March, when the humidity is low and breezes carry the scent everywhere. It has been humid and windless since this daphne started to bloom, so maybe that has something to do with it?