I've been using gatherer for a very long time and I really enjoy it. This is an amazing addon and I hope the good work is kept up!
Praise aside, I thought it might be a good idea to track the Felwood quest plants with gatherer. I know that it would definately prove useful to myself and many others.
The plants are picked using the cog-icon, just like a chest. They are:
However, before they are cleansed you need to apply Cenarion Plant Salve to the following plants: Corrupted Night Dragon Corrupted Songflower Corrupted Windblossom Corrupted Whipper Root Tuber