A Treeful of Pigs by Arnold Lobel, illustrated by Anita Lobel

From the back of the book:
It was the farmer's idea to buy the pigs. "We will look after them together," he promised his wife. But when they got the pigs home, the farmer was too busy sleeping to help - even when the pigs bloomed in the garden like flowers, or hung, like apples, from the tree. For a while the farmer's wife did all the work, until the day came when she decided to wake her husband up, once and for all...