This isn't confirmed yet but it's worked 100% of the time for me.
I was fooling around while picking herbs today and noticed that if you are picking an "Orange" herb, press the "M" button rapidly to bring up your map and bring it down, if the herb picking finished while you are doing this you will get the herb 100% of the time and will never get the message "Failed to Pick" or whatever.
have fun with this
-----)(Please leave the copyright text intact)(-----
This post is copyright by the user posting it and MMOwned.com - World of Warcraft Exploits,Hacks, Bots and Guides, where it was posted. You may not copy or reproduce this information on any other site without written permission from both the poster and MMOwned.com