The Language of Flowers is a discovery sidequests in Chapter 8, "Budding Bodyguard", in Final Fantasy VII Remake. While return to her house after helping residents in the town, Cloud Strife is stopped by Aerith Gainsborough asking him to accompany her to a flower bed.
The quest begins after Aerith beckons out to Cloud while returning to her house. Cross the bridge to her island and a cutscene will commence. After it is complete, an MP Up Materia can be found on the ground at the end.