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Date & Time
7:45 pm - 9:45 pm

Led by Peeka Trenkle, with Drew DiVittorio, Dipl (NCCAOM), and David Winston

Herbal medicine has been in use for thousands of years, each culture having its own unique system based on the herbs of its bio-region. In the last hundred years, we have steadily moved away from our ability to use herbs in a daily way for nourishment and healing, and have all but lost the ability to use herbs medicinally for treatment of acute illness. We no longer cultivate physic gardens in which families used to grow their own medicine or keep recipe books of remedies that healed illnesses in our communities. Foraging of wild plants for food has also largely been lost as a skill. Industrialization has led to a fear of nature, and several generations have now grown up believing that natural and herbal remedies are quaint but impotent and that pharmaceutical drugs are the only effective treatment for illness. All the work of healing has been delegated to the “experts,” both mainstream and alternative.

This course will give you a comprehensive overview of Western herbs for medicinal and nutritional uses, and our guest speakers will broaden the scope by presenting in-depth information from other various cultures. We will cover each of the body’s systems, the anatomy and physiology of each system and its functioning. You will learn about herbs for tonification, herbal treatment programs for illnesses relating to each system and how to prevent illness, promote vitality and maintain balance in the body through the use of herbs.

We will also cover the history of Western herbalism and how we got to where we are now, and the legal considerations of being an herbalist. In addition, we’ll discuss the use of herbs in an ecological context so that we can wisely choose the most effective herb and not be using endangered or threatened species.

The herbal materia medica in this course primarily focuses on herbs from the northeast United States, including a few from other regions of North America, in order to foster a bioregional understanding: Our region can, in fact, produce all the plants necessary for our healing.

Note: A certificate of completion will be given upon completion of course requirements.

Note: There will be a $30 materials fee for course manual, payable to the instructor at the first session.

Monday sessions (all led by Peeka Trenkle) will be from 7:45–9:45pm. Saturday & Sunday workshops will be from 10am–5:30pm. The field trip will be from 11am–4:30pm.

Free introductory class on Monday, September 21, 7:45pm.

A Brief History of Western Herbalism
Monday, October 19

Preparations & Dosages
Monday, October 26

The Digestive System and Liver
Monday, November 2

The Respiratory System
Monday, November 9

The Nervous System and Brain
Monday, November 16

Herbal Pharmacy: Making Herbal Products
A one-day hands-on workshop with Peeka Trenkle in making extracts, salves, balms, poultices, etc. There will be an $8 materials fee.
Sunday, November 22

The Endocrine System
Monday, November 23

The Circulatory System: Blood and Lymph
Monday, November 30

The Skin
Monday, December 7

Women’s Reproductive System
Monday, December 14

Basic Chinese Diagnostic Techniques
with Drew DiVittorio
An introduction to Chinese diagnostic techniques including pulse taking, tongue and complexion exams, and reading symptoms & signs.
Saturday, December 19

Men’s Reproductive System
Monday, January 11

Seasonal Healing: Herbal Therapeutics and the Cycle of the Year
Monday, January 25

Herbal Treatment and Management of Chronic Illnesses: Eastern and Western Approaches
A one-day workshop with Drew DiVittorio
Sunday, January 31

Musculo-Skeletal System
Monday, February 1

Urinary Tract and Kidneys
Monday, February 8

Materia Medica/Herbal Medicine Chest
Monday, February  22

Herbal Energetics
David Winston will discuss simple techniques for matching herbal qualities with the energetics of an individual’s symptoms, using concepts from Chinese and Cherokee medical systems.
Sunday, February 28 (ends at 5pm)

Case Taking Skills I
Monday, February 29

Case Taking Skills II
Monday, March 7

Field Trip with Peeka Trenkle
We will identify, taste and study herbs and wild foods at Stephen and Robin Larsen’s Stone Mountain Farm in the mid-Hudson Valley.
Saturday, June 4

October 19, 2015–March 7, 2016
plus field trip (June 4)

Full Payment: 15FHG25LA
$1,500 (No Member Discount)

Payment Plan: 15FHG25LB
$1,600 (No Member Discount)
A non-refundable deposit of $400 is due upon registration. Three further payments of $400 are due Nov. 16, Dec. 14 & Jan. 25.
Automatic credit card payments only.

Free introductory class on Monday, September 21, 7:45pm.

If you are interested in receiving more information about this training sign-up for the Green Medicine email list.

New York Open Center



  • David Winston, RH (AHG), an herbalist and ethnobotanist with 40 years’ training in Cherokee, Chinese and Western herbal traditions, is the founder/director of the Herbal Therapeutics Research Library and dean of David Winston’s Center for Herbal Studies. David is a founding member of the American Herbalist Guild.
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  • Drew DiVittorio, Dipl (NCCAOM)
    Drew DiVittorio, Dipl (NCCAOM), board-certified in Traditional Chinese Herbology, is an associate professor at the University of Bridgeport Acupuncture Institute and in private practice in NYC. He is a popular speaker on nutrition and Chinese herbalism.
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  • Peeka Trenkle
    Peeka Trenkle has been in practice as a non-medical, intuitive natural healer for over 30 years. Her current focus in practice is in the use of homeopathy, herbalism, dreams and inner work to catalyze the healing process and foster a more conscious integration of physical and spiritual healing. She maintains offices in Manhattan and NJ and has been on the Open Center faculty since 1996. Peeka Trenkle | A Unique Perspective on Healing
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