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This is general info for TBC herbs,as topic says.Maybe not so needed,but it can be helpful.

Felweed

Where can be found:
Blade's Edge Mountains,Zangarmarsh,Hellfire Peninsula,Nagrand,Netherstorm,Shadowmoon Valley,Terokkar Forest and some instances meaning that this herb can be found almost everywhere. See more information from WoW Gold, cheap WoW gold

Used in:
Fel Regeneration Potion
Elixir of Camouflage
Elixir of Major Strength
Elixir of Major Agility
Super Mana Potion
Sneaking Potion
Super Healing Potion
Volatile Healing Potion
Unstable Mana Potion
Onslaught Elixir
Adept's Elixir
Elixir of Mastery
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Terocone

Where can be found:
Shadowmoon Valley,Terokkar Forest.
From my experience,they are usually near trees.So if you want to grind them,I would say that Terokkar is the best place. See more information from WoW Gold, cheap WoW gold

Used in:
Elixir of Major Agility
Heroic Potion
Haste Potion
Insane Strength Potion
Elixir of Mastery
Fel Strength Elixir
Elixir of the Searching Eye
Elixir of Major Defense
Flask of Relentless Assault 
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