Haiku is a form of poetry that originated in Japan and for hundreds of years, school children in Japan have been introduced to poetry through the work of Issa. He was born in central Japan in 1763 and began writing poetry as a young child. Issa had a deep love for the natural world and it is the natural world that is the subject of not only his poems, but most traditional haiku. The book Cool Melons is a classic introduction to Issa's poems and an inspirational book about haiku, nature and life.
Traditionally haiku consist of 17 on ("syllables"), in three phrases of 5, 7, and 5 on respectively. They take nature as their subject and include the juxtaposition of two images or ideas.Today's haiku play with the format, but usually stick to the three lines and about 17 syllables. See this lesson on youtube.
The teachers at my school make good use of the books of haiku that I have in the library, so I am happy to add new ones if I know they will be used. We have these.There is something for everyone here and quite a range. Betsy Snyder writes haiku for the very young, even for board books. There is a couple of 'how to' books, anthologies of poems and stories told in haiku.