The Agapanthus, which come in blue and white, eventually fade and set seed. Cutting off the heads before the seed is dispersed is one way of taming their abundance.
A job for this weekend, cutting the spent Agapanthus blooms, it's already too late for some.
James 3:5-6 (New International Version)
Taming the tongue: Likewise the tongue is a small part of the body, but it makes great boasts. Consider what a great forest is set on fire by a small spark. The tongue also is a fire, a world of evil among the parts of the body. It corrupts the whole person, sets the whole course of his life on fire, and is itself set on fire by hell.