The reforestation of conifers is one of the main forest formations of the park, frequent especially on the southern and eastern slopes, at altitudes between 150 and 1000 meters. The anthropic origin is the basis of their reduced naturalistic value, with a low level of floristic diversity, due to the acidification of the substrate and the thick layer of needles deposited on the ground, which allows the development of a few species. In all the pinewoods, however, there is a slow and gradual renewal with species dominating the Holm-oak (Quercus ilex), due both to the reduced rate of renewal of these artificial associations, and to the progressive replacement of them with native forests.
Vesuvian pinewoods can mainly consist of domestic pine (Pinus pinea), used in the past for the production of valuable pine nuts, maritime pine (Pinus pinaster), and, to a lesser and localized extent, black pine (Pinus nigra); mixed pine forests are also widespread, especially on the northern slopes of Vesuvius. In the diorama is represented a pinewood Pinus pinea.