Easy Mana Thistles
1) Travel to Terokkar Forest
2) Go to 22.10 and look for a subzone. (The Barrier Hills)
3) Use your flying mount to get there.
4) You will easily find 3-4 mana thistles w/ a fast respawn.
Joana’s WoW Guide
Joana’s Horde Leveling World of Warcraft Guide