As you know, we have been studying Japan -- specifically during the Tokugawa Shogunate (1603-1868).
We read the following books about haiku.
One Leaf Rides the Wind by Celeste D. Mannis
The Cuckoo's Haiku and Other Birding Poems by Michael J. Rosen
What is the Moon? Japanese Haiku Sequence by Ruby Lytle
Wabi Sabi by Mark Reibstein
Grass Sandals: The Travels of Basho by Dawnine Spivak
(About a poet in the 17th century, Basho, who traveled through Japan) Includes several haiku and beautiful art work. See here for more information about him.
Cool Melons -- Turn to Frogs: The Life and Poems of Issa
(Another poet in the 18th century who traveled and wrote Haiku.
Today and Today -- Haiku by Issa
In the Eyes of the Cat: Japanese Poetry for All Seasons by Demi
Though not exclusively haiku, we also read Fold Me a Poem by Kristine O'Connell George. Afterward, the boys made some of these simple origami. A teacher's guide to accompany the book can be found here. You will actually meet the poet in Magic Tree House # 37 Dragon of the Red Dawn.
The boys then wrote their own haiku.
Stormy nights at wind
Then out of nowhere, light comes
A peaceful evening
The fireflies buzz all around
All things are at peace.