Ok then, I'm just gonna list the high end stuff by Zone and where I farm(and I'll probably forget a few), Caps=lots, normal=some:
Plauglands (east and west): PLAUGEBLOOM, DREAMFOIL, mountain silversage, sungrass, arthas tears, golden samsan.
Unguru Crater: MOUNTAIN SILVERSAGE, dreamfoil, sungrass, GOLDEN SAMSAN, blindweed(around the tar pits).
Strangelthorn: KINGSBLOOD, KADGAR'S WHISKERS, GOLDTHORN, fadeleaf, STRANGELKELP, LIFEROOT.
Swamp of Sorrows:BLINDWEED, kadgar's whiskers, kingsblood, goldthorn, fadeleaf.
Blasted Lands:sungrass, gromsblood, firebloom
Winterspring: ICECAP (this is the only Zone currently where you will find this), MOUNTAIN SILVERSAGE (and other then a few sprouts of black lotus that is all you will find there).
These are the zones that are, IMHO most abundent in herbs so I stick to them for a better spawn rate.
Gordantell