Publicly voiced apologetic effusions are two-a-penny. Verbiage does not feel like real remorse, just more like empty, noisy chatter.
A hand-picked, hand-delivered floral profusion is gold. Floriography is a quiet expression of words with flowers.
Imagine how noisy the world would be if all the flowers could could talk. Arrangements, be it bouquets or bunches, of colours and perfumes, of flowers and foliage, have long held symbolic associations. Herbage has a floral messaging power. The choice of flowers is profuse.