★★★★★
In addition, we collect the gravel root each August and feed it to our dairy goats. We lost a buck about 15 years ago to kidney stones. Haven't had a case since. Also, a friend cleared up his kidney stones and has had no more. He was seeing a doctor every few months and was told he would have to for the rest of his life. Now he drinks a glass or two a week of the tea and has had no trouble for 2-3 years plus his general health has improved.
All parts of the plant are useful, but we don't mess with the roots because they are a pain to clean. We collect the plants from along creeks and country roadsides when their flowers are their brightest pink. (They are truly pink, NOT purplish. ) The following website has a good picture of the plant although the color is somewhat washed out. The flower head can be very conical. I suspect it is forming seeds: www.altnature.com/gallery/joe_pye_weed.htm.