here is a little tip for peeps who want to display both ores and herbs at the same time with out the need to enter battlegrounds and change tracking type but dont know how.
all you need is a program thats been around since day dot ' Gatherer' and 'Gatherermate'
once you load up you add ons enter gatherer mate
click on display settings then general and change show mining nodes to 'always show'
now in game select herbs as your tracker and there ya go 2 different types of nodes displayed at once
disclaimer for the flamers: this does not physically track 2 different nodes at the same time but uses data gathered to display the known locations of spawning nodes