I am interested in herbal medicines/gardens/etc as well, and when we were at the book store a few days ago, I picked up these two books:
Homegrown Herbs by Hartung
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Homegrown%20Herbs%20hartung
and
Herb Gardening for the Midwest by Knapke and Peters
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Herb+Gardening+for+the+Midwest&rh=i%3Aaps%2Ck%3AHerb+Gardening+for+the+Midwest
Why I bought them is because not only do they tell a little about herb gardening methods, a little bit is also given on pests, good bugs, and profiles for quite a number of individual herbs. Some instructions for preparations are also given. What cinched them for me was the information each had for stevia. I figured that if both books were as accessible with that info (which IMHO they are) then they would be good references for other herbs as well.
Such things in the herb profiles cover what kind of shade/sun, tips, harvesting/processing, uses. “Homegrown”
also includes companion and complementary planting, medicinal benefits, and parts used.
That isn’t an exhaustive review, but might be enough to see if it is as interesting for you as it was for me!
Passion Flower, besides being pretty has medicinal uses, too.
My CVS has lots of Mexican herbal teas/remedies, but I see they don't have them online. There is one called 9 azahares (9 blossoms) that has calmative, relaxing effects.
I used to make catnip,valerian root, vervain, skullcap tea for cramps when I was in high school. It was very effective.