Aspen is the remedy for any fear whose cause can’t be named. It may be no more than a sense of foreboding, an uneasy anxiety that something unpleasant or frightening is going to happen. It is different from Mimulus which is for fears that can be named. Dr. Bach used to say that fear of the dark is a Mimulus kind of fear since the cause (i.e., the dark) can be named. And nameless Aspen fears are just as likely to occur in full sunlight as on a dark night.