Iris Cohen schreef
I am still trying to figure out the purpose of Callicarpa berries, which
were apparently one of those random mutations that people love to puzzle
over.

Iris,

+ + +
Callicarpa does not have berries, but drupes.
I am wondering if the blue color is somehow connected with this.
Prunes also tend to be blue and also are drupes.
Just idly wondering.
PvR