Bosc Gran consists primarily of Mediterranean Aleppo pine (Pinus halepensis) woodland, accompanied by occasional holm oaks (Quercus ilex) and wild olive trees (Olea europaea var. sylvestris). The understorey is made up of calcareous scrubland (32 ae), grasslands and annual herb communities characteristic of lowland limestone soils (34h), supporting a rich variety of plant species: Shrub species include mastic tree (Pistacia lentiscus), kermes oak (Quercus coccifera), Montpellier cistus (Cistus monspeliensis), sage-leaved rockrose (Cistus salviifolius), Cistus clusii, rosemary (Rosmarinus officinalis), Helianthemum syriacum, rue (Ruta graveolens), albaida (Anthyllis cytisoides), felty germander (Teucrium polium), black hawthorn (Rhamnus lycioides) and gorse (Ulex parviflorus). Herbaceous plants include Mediterranean false brome (Brachypodium retusum) and sweet alyssum (Lobularia maritima), while climbing species include fragrant virgin’s bower (Clematis flammula), sarsaparille (Smilax aspera) and wild madder (Rubia peregrina).

Particularly noteworthy is the presence of species more commonly associated with arid and sandy environments, such as bufalaga hirsuta (Thymelaea hirsuta) and spotted yellow sun rose (Halimium halimifolium).

As can be seen, Bosc Gran supports a remarkable diversity of plant life within a relatively small area. This diversity includes aromatic and sclerophyllous species alongside a wide range of shrubs and herbaceous plants. The coexistence of species typical of drier, sandier habitats further increases the ecological richness and complexity of this distinctive woodland ecosystem.