For the fourth consecutive year, the seed harvesting campaign was implemented to increase the stock of native tree seeds (Q. cerris, Q. pubescens, Q. ilex, Q. suber, Fraxinus spp.). About 12 000 tree seeds were harvested in Palo Laziale (October, 5th) and in the Presidential Estate of Castelporziano (October, 10-11). These seeds have been transferred to the nursery for batching, sowing and controlled growth. The nursery staff of ARSIAL has then planted the seeds to increase the number of cultivated seedlings.