Ive just built my second raised bed garden. And im looking to dedicate a large portion to growing herbs for tea. The price of good tea is very expensive to say the least. Plus it goes in line with my homesteading lifestyle.
You might want to check out "Back To Eden" by Jethro Kloss. Quite an amazing book. Also "The Complete Medicinal Herbal" by Penelope Ody. "Practical Handbook of Plant Alchemy How to Prepare Medicinal Essences Tinctures and Elixirs" by Manfred M. Junius. None of these books address the growing part of it though.