Buxus is a genus of about 70 species in the family Buxaceae. The common name is Box or Boxwood. It looks like you may need to water yours because it showing drought stress in the photos. If you really want to help your shrubs grow and look really good, aerate the soil 2 inches deep around the base of the plants after every rain or watering. I just use a hand cultivator and work the soil well and you would be suprised how much difference it makes. What it does is allows the oxygen in the soil and displaced nutrients to be available to the plant.