This guide shows you one or more of the best and most efficient routes to farm Liferoot in World of Warcraft Classic and is exactly what you need if you want to gather materials yourself instead of spending your gold on it on the auction house. If Liferoot is not what you are looking for, you may take a look at all available farming guides.
You need Herbalism 150 to gather this herb.
The Sea around Scholomance is the best spot to farm this herb. Just ride/run circles around it and gather every herb you see.
This area is also not too shabby to farm Liferoot.
For suggestions, improvement proposals or in case of finding a bug you are
welcome to contact me on my Goldgoblin Discord. Thanks a lot!