I've tried it on my rogue and i got it up to 300 easily within 8 hours. Okay, so what you do is hop on your mount, go around noob zones for a while, collect them, when you get to 75, hop on over to silverpine forest. This will really take a while, gather briarthorn and mageroyal and bruiseweed that you can see. Once you have about 125ish, travel over to hillsbrad foothills where there will be ton of kingsblood. Pick those up until 150, go to the rivers and find liferoots. Once you have about 175-185ish, go to arathi highlands and search for khadgar's whiskers and goldthorn. Once they become green, head on over to swamp of sorrow and i think you'll be able to pick blindweed up. Once thats done, you should have about 250-270, go to western plaguelands and just farm the herbs there.
This guide was unresearched so it might be a tad off.