Ball moss is not actually a moss despite its name. It is an epiphytic bromeliad that grows on trees, shrubs, and other surfaces. While ball moss is generally harmless to healthy trees, it can become problematic when it forms dense clusters, potentially restricting sunlight and airflow to the host tree's branches.
Ball moss can detract from the visual appeal of your trees. Heavy clusters of ball moss can accumulate on branches, adding weight and increasing the risk of branch failure.
