In this guide, I’ll recommend you head to Durotar and then head to North Barrens, South Barrens, Wetlands and then Arathi Highlands till 225. Finally, make sure you have the Gatherer Addon installed and setup properly before using this guide. You can even click to loot an herb while mounted, and you will be auto unmounted on arrival. It will let you click an herb off in the distance and it will send your character there and have him/her loot on arrival.
Use ‘Click to Move’ in your Interface->Mouse options. Use your ‘Find Herbs’ tool while leveling, do this by left clicking on the icon connected to your minimap and going down to ‘Find Herbs’: Subtract about 5 levels and head to a zone of that level (Tanaris/Feralas is good for levels 40-45) and you should have decent luck leveling your Herbalism there, or just use this guide’s maps. Consider your Herbalism level, pretend it’s 240/300. This Wotlk Herbalism guide will show you the fastest and easiest way to level your Herbalism skill from 1 to 450.