The single known population of Newcomb's tree snail occurs on private land that is currently zoned and managed as conservation land. However, the habitat on the ridge where 8 of the 9 living Newcomb's snail were found is badly degraded by the invasion of nonnative invasive plants. Many of the small ohia lehua trees that are the main host tree for this tree snail have died as well as two trees that had marked Newcomb's tree snails in them. The native uluhe fern is being replaced by "Rubus" sp. (blackberry), "Melinis minutiflora" (molasses grass), "Tibouchina" sp., and invasive grasses.