What they looked like in July (top) and last November (bottom):
In Japanese tradition, the willow is associated with ghosts. It is popularly supposed that a ghost will appear where a willow grows. Willow trees are also quite prevalent in folklore and myths.
In English folklore, a willow tree is believed to be quite sinister, capable of uprooting itself and stalking travellers.
More on Willows: https://en.wikipedia.org/wiki/Willow