So, I spent a good amount of time foraging branches in Eldarr Forest but decided to check out Blightfire Moors. If you head to the swamp area in the middle-eastern part of the zone, the respawn rate is fast and drop rate seems pretty high. I killed the trees for about 20 minutes and had 6 Straight Oak Treant Branches, 9 Straight Treant Branches, and 5 Dry Treant Branches. This is way faster than other methods.
I do this while foraging on a second account in Eldarr. Eldarr is also nice if you don't have a lot of time to invest. In the NW area of the zone about 8-10 branches will spawn a couple times a day on the ground. 4 inside the hollow tree, several in the nearby surrounding area and 4-5 to the south in the big ditch area.
Edited, Apr 28th 2022 3:47pm by rahzel44