The species grow on a wide range of trees, and can eventually prove fatal to them where infestation is heavy, though damage more commonly only results in growth reduction. All mistletoes are hemiparasites, bearing evergreen leaves that carry out some photosynthesis on their own, relying on the host mainly for water and the mineral nutrients it carries. The genus Arceuthobium (dwarf mistletoe; Santalaceae) has reduced photosynthesis. As an adult, it manufactures only a small percentage of the sugars it needs from its own photosythesis but as a seedling it actively photosynthesizes until a connection to the host is established.