Sakura Arborism is a World Quest that can be accepted from the Shrine Maiden, Miyuki, in Inazuma’s Kannazuka. After destroying the Treasure Hoarder camp, she’ll ask you to remove juvenile antics from five Thunder Sakura in the area. This will turn off their deadly lightning strikes and heal them.
The five Thunder Sakura can be found in the areas circled in the image below. They can be visited in any order.
The Thunder Sakura will attack you with lightning strikes. These strikes will follow you, so standing in the same place for a few seconds will prompt the lightning to strike in the same spot.
Turn on Elemental Sight to find a blue aura. Then, stand on the blue aura and wait for the lightning to strike. If you have a shield, you can simply stand there without getting knocked back. But if you don’t have a shield, you can stand on the aura and quickly dash away before the lightning attacks you.
There are around three blue auras surrounding each Thunder Sakura, so turn on Elemental Sight and keep your eyes peeled for them. After all three have been struck by lightning, the lightning will turn off. Interact with the glowing Investigate spot on the Thunder Sakura to pick up the Foreign Object, which you need to bring back to Miyuki later on.
Check out our guide on How to unlock and complete the Clean House World Quest in Genshin Impact to complete your Inazuma Reputation.
