Many of us have been frustrated by the conflicting and often unreliable information available concerning the growing and use of Japanese tadeai indigo (Persicaria tinctoria, a.k.a., Polygonum tinctortium ) in North America, so a few of us decided to band together and try our hand at finding growing methods that work well in different regions of the United Sates. Toward this end, we will be making a good-hearted attempt to remove as many variables from the process as we are able in our attempts to gather and standardize the information we plan to present here.  In addition, our goal is to perform several experiments with the results of our harvest, and then as a group test the fastness of our colors to repeated washings, sun exposure, and crocking.
  Whether you are part of the immediate group or not, your suggestions and questions are always welcome, along with any personal experiences on the subject you may care to share. Please check out the links below to keep track of our progress. Feel free to email us at TSG@JohnMarshall.to.

-Tadeai Study Group (TSG)
Separate pages will be maintained for each individual or group participating. To check in on the progress of each region, click on the state abbreviation next to their names below or on the corresponding red dot on the map below.
Participants (in alphabetical order of State)
CA: John Marshall (Covelo, California)
CO: Donna Brown with the Denver Dye Study Group  (Denver, Co)
FL: Suzanne Connors (Stuart, Florida)
IL: Pamela Feldman (Chicago, Illinois)
NY: Sara Burnett  (Middlesex, New York)
TX: Deb McClintock (Johnson City, Texas)
WA: Cheryl Lawrence (Whidbey Island, Washington State)

Seed stock:
We are all using the same seed stock. The seeds were harvest from John’s garden in the fall of 2016. The plants from which they were harvested were grown from seeds from many different sources. All, one way or another, came from sources originating in the Tokushima area of Japan. Click on the red dot to the left to read more about tadeai in Tokushima.