In first place i want to say sorry if this is repost . I noticed this in my long trips underwater.
Many herbs and Obsidium deposits have mobs close to them and if want that herb/ore in most of cases you need to kill or cc the mob .
Here is the tip , if you get close to the herb/ore from ABOVE mob will not be agroed .
I know this can be used only from peoples who do mining /herbing by hands ,but still can be nice time saving if you do not want to bother whit mobs .
P.S. My english is not so good , i hope you guys and girls will understand me