Below is a list of flowers from the game, where to obtain them and how much they sell for.
Flowers (along with forage & Tree Sap) are one category of the items scored in the grange display at the Stardew Valley Fair.
Flowers (other than Crocus, Sweet Pea, & Sunflower) grown as crops will affect the type of Honey produced by nearby Bee Houses.
Sunflowers can be processed in the Oil Maker to produce Oil.
Dandelion and Daffodil are not listed here because they are "Forage" in the game, and not "Flowers."
- Note - Crocus and Sweet Pea are not affected by the Tiller Profession bonus because they do not count as crops, despite the fact that they can be grown from Wild Seeds.