After completing the task for Gai Lan, he will meet you at Sunsong Ranch, where he will spend several minutes spraying weed killer on the westernmost corner of the irrigable land, creating new space for you to plant 4 vegetables.
While he is killing the weeds, you will get a buff that tells you how many minutes are remaining.
Quest
Growing the Farm I: The Weeds
A World of Warcraft quest in Valley of the Four Winds. Facts and objectives from the current retail game data.
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Finishing this quest line upgrades your farm and allows you to buy the "Jinyu Princess" Irrigation System from Gina Mudclaw.
The improvements to your farm take 15 minutes. You receive a buff called Growing the Farm that shows how long you have before they will be completed. The buff is not applied until you enter the farm plot phase. During this time Gai Lan sprays the herbicide you just helped him make onto the weeds in your field.
Also note that since this is a buff, you must be logged into the game for 15 minutes before the buff falls off and the change takes effect.
Once the irrigation system is installed, you must leave your farm and return before the irrigation system will appear.
To actually get this quest you have to be honored with The Tillers faction.
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(30260))
Requirements
Read from the Blizzard quest API.
Description
Hey {name}, I've been thinkin' recently about expanding my farm. See that plot there that's just covered in weeds? If we can get rid of those weeds, we could use that land for planting. I heard there's a farmer by the name of Gai Lan who knows a thing or two about weed whackin'. His farm is just out west. Go talk to him and see if he'd be willing to help us.
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Reward details
Reputation: The Tillers +500
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.