Did you check the herbalism guide/ Trade Skill Sticky? Here is what is written:
Quote:
Sungrass:
http://wow.allakhazam.com/db/item.html?witem=8838
One ofthe most in-demand herbs, and it becomes prevalent in recipes right when it is most difficult to collect. This herb should really only be chased down when you are post 40; with a mount, you can run into an area, grab the spawn, and run like hell before the monsters bite you. After its usefulness has faded and you gain enough levels to fight off the enemies often uarding it, Sungrass is more of a Sunweed; it is in almost every high-level zone, out in the open. For the adventurous types who wnat to hunt it at lower levels, you can find some spawns in the Blasted Lands, Azshara, Feralas, and the Hinterlands.