Love picking plants? Love to frolic in nature? Then Herbalism is right for you. World of Warcraft Herbalism is the most prolific profession there is. Being able to pick these herbs, allows you to trade with alchemy who usually want these or enchanting. Here is a list of WoW herbs and the skill needed to pick them;

    Peacebloom - 1      
    Silverleaf - 1
    Earthroot - 15
    Mageroyal - 50
    Briarthorn - 70
    Stranglekelp - 85
    Swiftthistle - * (found uncommonly on Mageroyal and Briarthorn plants)
    Bruiseweed - 100
    Wild Steelbloom - 115
    Grave Moss - 120
    King's Blood - 125
    Liferoot - 150
    Fadeleaf - 160
    Khadgar's Whiskers - 185
    Wintersbite - 195
    Firebloom - 205
    Goldthorn - 215

The terrain also influences what type of herb you can find. So depending on what you are looking for, going to a certain terrain will yeild better chances of finding what you need.

Found in open meadows: Peacebloom, Mageroyal, King's Blood
Found under trees: Silverleaf, Briarthorn
Found on cliffs: Bruiseweed, Snakeroot, Wild Steelbloom
Found near buildings: Bruiseweed
Found on gravestones: Grave moss
Found in watery areas: Stranglekelp