Experts and BHG readers answer.
Sparse leaves on Drake Elm
Air plants and other types of bromeliads derive no nutrition from the trees to which they attach, so you need not worry that they are the cause of the sparse foliage on your tree. If the foliage is uniformly sparse throughout the tree, it's likely that the problem is on the main trunk or in the root system. It may also be a natural variation due to weather conditions or heavy seed production last year.