Ok, for you Hordies trying to farm Org rep, this quest chain is SO NOT worth the time spent getting only 500 rep (about as much as you get for doing 2 dailies in Org). The quest to come to Tabetha's farm at the start of THIS little quest chain IS NOT the same quest that Krog gives you when you first get to Brackenwall.
THIS quest chain only becomes available AFTER you do ALL the quest chains involving the Ruined Inn on the west side of the zone (where you come into Dustwallow from the Barrens).
DON'T start trying to do the Ruined Inn quests UNTIL you go to Brackenwall (Horde) or Theramore (Allie) and pick up the respective quests that actually send you there first. Until you FINSH all of the Ruined Inn quests (AND their follow-up quests), Tabetha will NOT have any quests for you.
FYI, not all, but a lot of the quest chains that finally lead to this one are NOT clearly connected together in the game or on the Wowhead site. You have to do your homework on this one, and keep checking the comment sections on Wowhead to follow the quest chains and how they're connected. I don't know how to post links here, the template for posting links isn't working for me.
To get to this quest chain will probably take you about an hour @ the zone's levels, depending on how many side quests you do. @ lvl 85, at least 30 minutes, it's a LOT of running around (see my follow-up post).
If you're past the levels for this zone and you're just looking for Org rep, skip this chain, do a couple of Org dailies instead, and move on.