Vesperlace is a flower, mentioned in Flashback, that is showcased by Flori in her endeavor to create a song that would get rid of Sophie and Fitz's echoes.
In the daytime, it appears as a wispy vine with leaves of a darker shade that has small clusters of pearl white buds.
It is said to only bloom at night, though its night-form was never shown. It is only able to grow in the darkest points of the most silent forests.
According to Flori, its melody is like the rhythm of darkness, that is the same pulse as that of the echoes.
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“I can still feel traces of the same pulse thrumming through the stems that I feel when I listen for your echo. I think it must be the rhythm of darkness. And that is where the song must begin.”