Welcome to STEM Tuesday: Author Interview, a repeating feature for the last Tuesday of every month. Go Science-Tech-Engineering-Math!
Today we’re learning with
Rebecca E. Hirsch, a science writer, educator, and author of more than 90 books for young people. Her 2024 book A Deathly Compendium of Poisonous Plants: Wicked Weeds and Sinister Seeds is a delightful collection of
science, folklore, true crime, quotes, and more, all about poisonous plants!
Andi Diehn: How did you get interested in poisonous plants? (Should we be worried?!)
Rebecca Hirsch: Great question! And there’s no need to worry, but now you’ve got me laughing! This book grew out of research I had done for a previous middle grade title, called When Plants Attack: Strange and Terrifying Plants. When I was researching that book and deciding what plants to feature in it,I came across a lot of poisonous plants. But poison wasn’t really the focus of that book, so I set most of those plants aside. Nevertheless, the seed had been planted. Several years later, I began to imagine writing a creepy, gothic book that looked at the science and history of poisonous plants.
AD: I love that you combine mythology, quotes, history, and science – why include all these elements?
RH: Poisonous plants have such fascinating back stories! People have long used these plants for medicine, as well as for darker acts like warfare and murder. As a science writer, I knew I wanted to share the science of these plants—facts about how and where they grow but also how they interact with and harm the human body. But I made the decision to start each chapter with an intriguing historical quote and whatever dark and fascinating stories I could dig up. My goal was to entertain readers in addition to educating them. I wanted them to see how captivating and complex these plants are.
AD: Many poisonous plants are useful as well as deadly. Does this make botany even more interesting?
RH: Definitely! Most people think of plants as boring, kind of like green statuary. But plants are actively struggling to survive, like all living things. Plants have very effective ways of fighting back against anything or anyone that tries to eat them. In the botanical world, the most common self-defense tactic is poison. Plants are master chemists. They are very good at concocting nasty chemicals, and some of these chemicals can make animals and people very sick.
AD: The chemical explanation of how different poisons work is fascinating. Do you think poison loses some of its fear factor when we learn about why it does what it does?
RH: For me, learning about these poisons made them even more terrifying. It’s alarming to discover how the deadliest of nightshades—belladonna, for instance—can unleash havoc on our brains and bodies. Or how ricin from castor beans can act like a wrecking ball to our vital organs. Or the way cocaine or opium can hijack our brains and produce crippling addiction.
I do think the fear factor can be a good thing, because it can protect us. At least, that’s my hope. I repeatedly encourage readers to steer clear of nearly all of the plants in the book.
AD: In a way, this book redefined my definition of poison when I read about peppers. I eat peppers all the time and never thought of the hot ones as poisonous. How does this show that even things we encounter every day can be harmful in large quantities or if used wrong?
RH: Oh yes, chilies are definitely poisonous. These plants manufacture their poison—a chemical called capsaicin—as a way to prevent mammals, including humans, from eating their fruits (the peppers).
Here’s a personal anecdote about chilies: A number of years ago, my garden produced a bumper crop of jalapeños, and I decided to dice and freeze my harvest. One evening, I pulled out a sharp knife and a cutting board, and went to work on a pile of shiny green jalapeños. Foolishly, I did not wear rubber gloves. When I was finished, I had a heap of diced jalapeños—and poison all over my hands. My skin burned, especially under my fingernails. Then I rubbed my eye. Now my eye was stinging and watering. I soaked my hands in milk and yogurt—dairy products are a remedy—but it didn’t help. I ended up staying awake half the night, unable to sleep because of the pain.
By the way, jalapeños measure about 5,000 on the Scoville scale, a measure of chili hotness. One of the chilies mentioned in my book, a variety called Pepper X, has a Scoville rating of 2.7 million! Jalapeños are quite mild in comparison, but even they can be painful in large quantities!
AD:What is your research process like? How do you find all the great stories included in your book?
RH: I love the research process. I can get lost in it! My process is to start general and then get more specific. I usually begin with general internet searches, and I also track down books that are written for a general audience. I use the public library to find nonfiction books on my topic, and I use my library’s online research tools to track down magazine articles. When I’m reading a book, I’m flipping to the back pages constantly, studying the source notes and bibliography. I want to see what sources that author used in their own research, so I can follow up with any promising sources.
As I go deeper on my research, I start moving into more scholarly works. For A Deathly Compendium of Poisonous Plants, those works included toxicology textbooks, scientific research on the action of poisons in the body, and scholarly books about the history of poisonous and medicinal plants. Google Scholar is my go-to place for tracking down scientific papers. My state university’s library system is where I find scholarly books. As I’m reading those scholarly papers and books, I’m also studying their bibliographies, and then I continue tracking down more sources.
AD: I love the artwork and design of the book. Did you have input or was that entirely up to Eugenia Nobati?
RH: I’m so glad you like it! The design was a part of the book concept from the beginning. When I pitched the idea to editor Shaina Olmainson, who was formerly at Zest Books at Lerner Publishing, she immediately got on board with my vision for the book having a creepy gothic vibe. Lerner’s design team also got behind the idea in a big way.
The Lerner team brought on Eugenia Nobati to illustrate. She had previously illustrated picture books for Lerner, but Eugenia also had experience creating darker, creepier art. Eugenia dove enthusiastically into the project. Her illustrations look like they had come out of an ancient laboratory notebook, with coffee rings and dark stains marking the pages.
AD:Do you have a favorite poison? (Not to use, but to learn about!) What is it and why?
RH: Mandrake was a lot of fun to write about. I had to force myself to stop working on that chapter and move on because I was so enchanted by that plant. It has such a rich and twisted folklore. In ancient and medieval times, people thought mandrake root resembled a naked body. They associated the plant with sexual potency and imagined that it had all sorts of magical powers.
AD: Did you find yourself being more careful about what you ate while writing this book?
RH: Truthfully, I’ve long been careful about what I eat. When I was a kid, I played outside an awful lot, and my parents impressed upon me never to nibble anything unfamiliar outdoors. When I was a teenager, I developed terrible food allergies, so that made me even more cautious. Alas, the chapter on allergies was written with a lot of firsthand experience.
I tried to pass along a sense of caution to my readers. Just because a plant is pretty or its berries look inviting, that does not mean it is safe to eat.
Rebecca Hircsh is an award-winning author of more than 90 books for young readers. Her books have been honored with a Riverby Award for Excellence in Nature Writing, a Green Prize for Sustainable Literature, a Green Earth Book Honor, and spots on many state reading lists. She studied biochemistry at the University of Massachusetts and molecular & cellular biology at the University of Wisconsin. She’s a member of the National Association of Science Writers, SCBWI, and The Poet’s Garage, a collective of professional children’s poets. Rebecca lives in Pennsylvania, where she regularly visit schools, sharing my love of science and the craft of writing.
Andi Diehn has written over 20 children’s science books, plus a picture book on mental health called MAMA’S DAYS from Reycraft Books. She works as a children’s book editor and marketer at Nomad Press and visits schools and libraries around the country to talk about science, poetry, mental wellness, and anything else kids want to know! Andi also works as a bookseller at her local indie in Vermont – The Norwich Bookstore – and lives in rural New Hampshire with her husband, three sons, and too many pets.
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Carla Mooney loves to explore the world around us and discover the details about how it works. An award-winning author of numerous nonfiction science books for kids and teens, she hopes to spark a healthy curiosity and love of science in today’s young people. She lives in Pennsylvania with her husband, three kids, and dog. Find her at 