You are reading this article to learn about Callistemon citrinus care and planting. Callistemon citrinus Little John Care Takeaways Bottlebrush Tree Bottlebrush tree or Callistemon citrinus (Latin name) is an evergreen shrub named for the spikes of the flowers that grow at the end of the branches, with a close resemblance to a bottle brush. The bottlebrush tree …