ヤグルマギク
The school flower is the blue cornflower or bachelor's button, "Centaurea cyanus", was chosen by Miss Livingston. Graduating seniors during her era wore white dresses and carried arm bouquets of the simple blossoms. The tradition has continued with each graduating senior carrying a bouquet of the blue flowers wrapped in flowing blue ribbons, which the school called “Ragged Robins.” At Garrison Forest, the term “Ragged Robins” applies to three longstanding traditions—the school flower, the yearbook, and the student "a cappella" group.