Culling the Herd (quest)

Objectives
A'dal has asked you to kill 6 Mutate Fleshlashers, 6 Mutate Fear-shriekers, 6 Mutate Horrors, and to obtain a Rapidly Evolving Frond from Laj in the Botanica of Tempest Keep.
 * Mutate Fleshlasher slain (6)
 * Mutate Fear-Shrieker slain (6)
 * Mutate Horror slain (6)
 * Rapidly Evolving Frond

Description
It seems that Kael'thas' forces have twisted the Botanica's specimens beyond saving. I do not want to see them unleashed upon Outland as so many others have.

There is one, Laj, who I would like to examine. He is different somehow. Perhaps we can learn from him.

Rewards
You will receive:
 * 19,000 XP

Progress
I see you have obtained the frond. Very good.

Completion
You have done well thus far,. However, there is still one more task I must ask that you complete.

Progression

 * 1) Saving the Botanica
 * 2) Culling the Herd (quest)
 * 3) A Most Somber Task