There needs to be more herb nodes in Brightwood, it is far too few. Also unlike many of the other towns, there is not a grouping near the settlement. One group is very far away near a tree, and the other group is also far away in an elite zone. That’s it, there is literally no other herbs in Brightwood.
This is made worse by the fact that Brightwood is one of the few placed to get tarragon (so people camp the spots), and now hyssop is also required for all potions as well.