So what is the plural of haiku? "I wrote a haiku. I wrote many ..." what?
Haiku? Maybe it's like giraffe or wildebeest to hunters. "I shot a brace of giraffe today."
Haikus? Perhaps, but it's not an English word, so do you still pluralize it like an English word?
Haiku's? That doesn't seem right. As far as I know the only place that apostrophes are correct for pluralization is for things like the 60's and 70's.
Perhaps someone could google it for me. I'm a busy man. I have bridges to burn.