Stop guessing. Start connecting the dots.

If you’ve ever done everything right — allergy testing, careful avoidance, food diaries — and still watched your child break out in hives, flare with eczema, or struggle with digestive symptoms for no clear reason, this guidebook is for you.

Rachel Parks isn’t a doctor. She’s a Botany teacher who spent years chasing her own son’s mystery reactions before realizing the answer wasn’t in another allergy panel — it was in plant taxonomy. Foods that seem completely unrelated on your plate are often close botanical relatives. Ragweed and chamomile. Coconut and palm oil. Peppers, potatoes, and tomatoes. Once she started tracking foods by their plant family instead of one at a time, the patterns — and the reactions — finally started making sense.

How it works

This guidebook gives you a system, not just information:

Find your foods. Use the A-Z Food Family Index to look up any food, herb, or plant-derived ingredient and see exactly which plant family it belongs to.
See the connections. Flip to that family’s chart to see every closely related food, sorted by genus, subfamily, and tribe — the plants most likely to cross-react.
Highlight and track. Mark known reaction foods in one color and foods you tolerate well in another. The charts show you what else to watch for — and, just as important, what related foods might be safe to try.

It’s not about cutting out an entire plant family because of one reaction. It’s about exploring with information instead of fear, so you can both narrow down triggers and rebuild a fuller, more confident diet.

What’s inside

The full story of how one family used plant taxonomy to solve years of unexplained allergic reactions
A plain-English explanation of plant classification — no science background required
Step-by-step instructions for using the index and charts together
An alphabetized A-Z index of hundreds of foods, herbs, and plant-derived ingredients with page references
Detailed charts for 20 major plant families, including Aster, Nightshade, Rose, Mint, Pea, Citrus, Mustard, Squash, Grass, Palm, and more
A section on other plant-derived products that can cross-react, including latex-fruit syndrome, alcohol, and skin care, oral care, and cosmetic ingredients
Printable personal food tracking charts (safe foods, unsafe foods, and an at-a-glance food diary) — print one per family member

Who this is for…

Parents and individuals managing multiple plant-based food allergies or sensitivities, anyone with unexplained hives, eczema, or digestive symptoms despite avoiding known allergens, people newly diagnosed who want to understand what else might affect them, and anyone curious about the botanical relationships behind the foods they eat.

A note on safety

This guidebook is an educational reference tool, not medical advice. It does not diagnose, treat, cure, or prevent any condition, and a botanical relationship between two foods does not guarantee cross-reactivity. Always work with your physician or allergist for diagnosis and treatment, and never delay care for a reaction that could be anaphylactic.

Try our Free Food Safety Quiz to see what foods you might be able to safely swap.

You also might be interested in our Food Family Database where you can see the botanical relationships of any food on the go straight from your phone. Use it at restaurants, grocery stores, anywhere you need to know if an ingredient is related to a food that you react to.

foods by plant family

Foods by Plant Family Guidebook