The College of Practitioners of Phytotherapy: https://thecpp.uk/
Herbal Reality (a great resource for information about herbs, herbalists and herbalism): https://www.herbalreality.com/
The Herbal Alliance: https://www.herbalalliance.uk/
The European Herbal & Traditional Medicine Practitioners Association: http://ehtpa.org/
The Journal of Herbal Medicine: https://www.sciencedirect.com/journal/journal-of-herbal-medicine
Herbal History Research Network blog (for articles about researching the history of herbal medicine: https://www.herbalhistory.org/home/blog/