I find it hard to believe but it is just about twenty years ago, that Poppy was published. That book and the five other Poppy titles constitute my only true complete series. It was not meant to be a series, and indeed, I did not write them in sequence. Poppy came first, followed (belatedly) by Poppy and Rye. Then I realized I needed to relate Ragweed’s story, so I wrote his tale, and it functions as the first of the series. Ereth’s Birthday, Poppy’s Return, and finally Poppy and Ereth followed in proper order.
The process of writing them was very much more like visiting a family of whom I was fond, than sitting down and inventing a story. Perhaps that happened because there are many elements in the stories that truly did come from my family.
Then in addition, Brian Floca’s illustrations—while in many ways were necessarily consistent– seemed to reveal more and more of the characters, and that greatly enhanced the series.
Why six books, and no more? I recalled reading The Little House series to my older boys, and knew how Wilder’s six books filled out a good year of family reading. That was good enough for me. Therefore six books.
Some years ago, HarperCollins (who publishes the books) asked me to speak about them. You can see that interview.
The last line of that interview sums up what I felt about concluding the series.