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Everyone contributes to Speranza in Arc Raiders, but Tian Wen prefers to do things her own way. She doesn’t usually mingle with others beyond the basics, but after Celeste urges her, Tian Wen wants to try doing a little more. She needs help from a Raider to make it happen.
Speranza constantly needs more greenhouses to grow food for the city. Tian Wen is looking for crucial materials to build some of these greenhouses, which are best found in the Buried City. Get your gun ready, pack some bandages, and search the rooftops for what you need.
How to Find the Rooftop Gardens in Piazza Roma
To locate the rooftop gardens she mentioned, head to the Piazza Roma area on the west side of the Buried City. The gardens are in the building closest to the southern entrance of Western Station.
You can either go through the building itself to gather loot first, or climb the yellow ladder at the edge of the upper of two buildings to reach the roof. Once on the rooftop, look for a water pump machine attached to one of the planters, connected by two hoses. Interact with the pump to get a guaranteed Water Pump, which will complete that part of the quest.
While exploring, remember to also look for lemon trees both inside and outside the city. They look like small, tall trees with thin branches and little lemons, and three lemons are needed for Scrappy’s second upgrade.
How to Find Fertilizer in Grandioso Apartments
The other location required for this quest is the Grandioso Apartments, situated at the southwestern edge of the Buried City, just south of Piazza Roma. To get inside, the easiest method is through one of the lower floors’ open windows on the southern side of the building. Move toward the middle of the rooms to find either a staircase or a zipline that leads to the roof.
Be cautious of Pop Rollers and Fireballs inside the building—they will track your movements even from different floors and can chase you onto the roof. Once you reach the roof, cross the small bridge to the northern side. On the roof’s edge, past two cages, you’ll find two plant pots sitting on a pallet.
Interact with these pots to collect the fertilizer you need. Afterwards, use the stairs or zipline to descend to the lower floor and exit through the northern end of the building. Make sure to have the fertilizer and water pump in your inventory before leaving, and avoid selling these items.
Return to Speranza and speak with Tian Wen at her shop. Completing this mission rewards you with experience points, the uncommon IL Toro shotgun, 40 shotgun shells, and a Shotgun Choke II modification.




