RHS Encyclopedia of Herbs by Deni Bown, ISBN 10: 1405332387, ISBN 13: 978-1405332385
Does it every way, it also goes into essential oils and natural dyes too. It is very well written with many interesting anecdotes about the history and mythology surrounding herbs too. However the index can be a bit of a bugger to use as it is so in depth that there are many references and the main sections on each herb are not in bold, it is also alphabetically listed by latin name which doesn't help either but besides these flaws, a great book.
The Green Pharmacy by Dr James A Duke, ISBN 10: 0875963161, ISBN 13: 9780875963167
Is much easier to use but doesn't cover growing herbs, only their uses; also covers essential oils. Dr Duke has other books out there that look good too but I have no personal experience of them. He has a huge database he's made about herbs but I have not found it online yet in full form, his website has alot of info though..
http://www.greenpharmacy.com/
There's quite a bit on scribd.com too, I have downloaded alot of it but it is all on my portable hard drive is out on loan at the moment (knowledege is wealth, share the waelth), I can email/dropbox when get it back or even send you my scribd login if you're desperate.
Hope it helps,
W