If you plan this, the quest can be completed on the same day you get it. The day before you hit the reputation required you plant the seeds you will need for the quest. When you then get the quest, all you need to do is harvest the plants in your farm and plant new seeds (if you don't need the plants you can dig them up with the shovel after getting credit).
Quest
Nana's Vote III: Witchberry Julep
A World of Warcraft quest in Valley of the Four Winds. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Once you've completed this quest, you'll want to plant striped melons to prepare for Haohan's Vote IV: Melons For Felons.
You can "cheat" these quests by taking out your shovel, dig up a few plants and plant new ones over and over until you get the ones called "bursting <witchberry in this case>" which can be harvested right away. The chance seems to be quite low so it may take a while to complete it this way but it's a good way to do it if there's still some time left until the following midnight and you're desperate to get it done.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(31949))
Description
Now that we have the water, I can almost taste the icy cold witchberry julep! Now, we just need to find ourselves some sweet witchberries. My grandson's berries this season have been total slop, so I need to seek a decent harvest elsewhere. Say, do you have any witchberries in the ground this year? How about you bring me some from your farm? If your berries are up to the standard, we'll make ourselves a grand old batch of the old juice!
Community notes from Wowhead · 22 comments
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Reward details
Reputation: The Tillers +400
The Tillers are peaceful and productive pandaren, working with the land to feed the massive appetites of their people.
Reputation group: Mists of Pandaria.
Other quests in Valley of the Four Winds that reward The Tillers reputation: A Helping Hand (+900), Learn and Grow II: Tilling and Planting (+500), Learn and Grow III: Tending Crops (+500), Learn and Grow IV: Harvesting (+700), Learn and Grow V: Halfhill Market (+999), Mung-Mung's Vote I: A Hozen's Problem (+400).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.