So glad to know you are in Bulgaria now! Have a good time!
Yeah, such a spring scenery is very familiar to me when willow catkins are flying in the air. They look so ethereal like a dream. Willow catkin is a classical wording in ancient Chinese poetry and we can often find it in other poems. In my hometown there are also dandelions which I always love, but it seems that they haven't been chosen by poets luckily, failing to walk into the ancient Chinese poems. Whereas I have noticed that there are quite a few English poems on dandelion.
Nobody knows what time Su Shi wrote this poem due to lack of the historical records. But the Chinese expert in that video judges that it must be written in his young age since it is a poem full of joy and youth. Otherwise his concubine couldn't shed tears when she sang it. The only reason is that it is an old song which reminded her of her young time!