I made this Goldclover farming guide to help out players who want to farm the herbs instead of buying them from the Auction House. Goldclover is located in open fields devoid of snow, and it's recommended to have Herbalism 350 before you start farming, so you won't get any herb fragments.
Grizzly Hills is the best place to farm Goldclover. The route is easy to follow and the herbs will start respawning by the time you do a full lap.
Howling Fjord is also a great place to farm, I Just usually follow the yellow route because it's large enough to allow the herbs to start respawning at the start, but I included an alternative route marked with red for those who would prefer to farm the whole zone.
Borean Tundra is not much worse from the other zones, I just prefer the layout of Howling Fjord and Grizzly Hills.