Do you deadhead Calibrachoa?
Deadheading of Calibrachoa is not necessary except for the spring growth.  Mature plants can be cut down to about half the height for a more compact plant and a continual flush of blooms. Deadheading is a good way to keep your Calibrachoa looking fresh and to keep new blooms coming. It will also allow it to grow and flower faster and more profusely if you regularly deadhead it.