This part of the Soluce Fallout 4 : Far Harbor is dedicated to the Faction quest "Aster and its Flowers". Aster, the doctor from Acadia, asks you to bring her all the Aster flowers you can find.
Acquisition : Aster
Reward: 8 caps per flower
In Acadia, talk to Aster and offer your help so that she can tell you about her passion for flowers (picture1). From there, you can bring him all the Aster flowers you find in order to receive a small bonus. For example, you can find some near a tree to the north of the island (pictures2-3).