I was questing in Zangarmarsh when I found this out. In Serpent Lake, west of Coilfang reservoir (about 44,43) there are groups of 3-4 fish called frenzys. These frenzys have a very good chance of droping Unidentified Plant Parts. When you get 10 of these plant parts you can turn them in to Cenarion Expedition for about 250 rep points. So heres what you do:
1. Get an underwater breathing potion
2. go to Serpent lake (44,43)
3. go in the water and agro a bunch of frenzys (if you agro one of them the whole group of 3-4 of them will come)
4. kill the frenzys and loot them (this works better with classes that have strong AOE such as mages or warlocks)
I did this for about 15mins and got 30 unidentified plant parts. Each group drops about 1-2 plant parts and the frenzys are super easy to kill. I did this at lvl 63 with my mage (frost spec) and I was able to kill them with 3 arcane explotions. Have fun if you have any questions let me know.
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