when you feel to make a haiku, please include a seasonal word in it. If not, it is called Senryu, not haiku. OK?
@indigo6 What defines "seasonal word"? Is it limited to the names of the seasons and their variations (spring, autumnal, wintery, etc.)?
@PicklesTFC Thank you for asking. We have a long long list for it. Here you go. https://en.wikipedia.org/wiki/List_of_kigo