To restore the Water Shrine in Taro’s Love – Restore the Ancient Shrines to open the Guardian Tree in Kena: Bridge of Spirits use the Rot to move the two blue glowing stones on either side of the shrine into the two areas in front of the water shrine with blue crystals embedded in the ground.

Then go to the circular stone with the blue glow in the middle across the water and use the flash ability to restore the Water Shrine. After the corrupted flower opens up, use the Rot on it and then the bow to destroy the flower.