I absolutely adore pussy willow! It was the height of pussy willow season (is that a thing?) when we were in 
Toronto. I, of course, bought a big bunch, much to the amusement of my mother in law who didn't understand why I wouldn't wade through swamps (or something equally un-Hannah-like) to collect my own.
I have always loved the little fluffy buds and promptly stuck them in jars and vases around the house. They've lasted a long time and are only now, some 4 months later, starting to lose their 'togetherness'.