"To match the flowers" means to select or coordinate something, such as clothing or decorative items, that complements the colors or style of a particular arrangement of flowers. Full definition
This butter yellow coat (also worn here) works better than any other coat I have, and just so happens to match the flowers in the boots nicely. (thesequinist.com)
This will make color matching the flower girls to my dress really easy when I get a fitting this weekend! (jjshouse.com)
I love the way the pink flowers on the night stand match the flowers on the quilt. (shadymeadowcottage.com)