Cannabis Author and Educator

“Penny Barthel strikes the perfect blend of science and beauty in this most approachable guide to growing cannabis in the garden. Your hand will be held from start to glorious (vanilla bean-infused gummy) finish.”
Johanna Silver, author of Growing Weed in the Garden
Check out my interview with Homegrowers International founder, Michel Navedo

Book

Ten Speed Press/2021

Purchase here

The Cannabis Gardener teaches you how to choose which strains are right for you and how to cultivate the plants from seed to finished flower. Gorgeous full-color photographs capture each stage of the growing process and show how cannabis plants can be incorporated into your garden design as well as raised beds and containers. After you establish your plants in the garden and monitor them through the flowering stage, you’ll find tips on how to harvest, dry, cure, and store your “grow.” Also included are recipes for savoring your harvest, from salves, tisanes, and tinctures to cannabutter for baking and cooking delicious treats such as CBD gummies flavored with vanilla beans, cheddar crackers, and even cannabis chocolate sauce.

The Cannabis Gardener is an accessible and practical guide for any level of gardener interested in growing their own attractive cannabis plants.

New post

April 2026

Latest on Substack

It’s been a tumultuous Spring. We had record breaking heat in California, a 1000 year rain event in Hawaii, almost non-existent snowpack through the west, and then there’s the spectacle of living through the US’s current dark and unstable political climate. And yet in the midst of this I was encouraged by the Artemis 2 mission. There was a little thrill in my heart when I heard the words “Go for Launch” spoken just before four fine astronauts rocketed farther away from Earth than anyone has ever gone before. It reminded me of the goodness and promise of cooperation toward something bigger than us. Christina Koch’s reflection “Planet Earth. You are a crew” is our charge for this year. continue reading…

April 25, 10 am & May 14, 3:30 pm

NEW! Sloat Garden Centers

Just announced! I’ve added two NEW classes to the teaching schedule, at two different Sloat Garden Centers. Please join me and Dr. Emily Gogol as we teach you how to grow cannabis in the garden. We will have copies of my book, The Cannabis Gardener, for sale and Emily will have a full selection of her exceptional seeds for sale. Come with questions and curiosity, leave with everything you need to grow cannabis in the garden this season.

4/25 10 am 1555 Kirker Pass Rd, Concord

5/14, 3:30 pm, 2700 Sloat Blvd, SF


“If plants have IQ, cannabis is a genius. This lovely and practical book gracefully describes how to cultivate, support, encourage, and manifest the genius of this remarkable plant.”


David E. Presti, professor of neurobiology and psychology, University of California, Berkeley