In our region, promoting Neltuma alba (algarrobo blanco) plantations is crucial due to its ecological and productive value, requiring ongoing research for successful cultivation. Ensuring seedlings possess optimal physiological and morphological traits is essential for survival and adaptation after transplanting. Previous studies suggest plant biostimulants can aid in reducing stress during rustication and field planting stages. This work aimed to explore the potential of Larrea divaricata (Jarilla) phytoextract in varying doses as a biostimulant to enhance seedling quality and stress response in N. alba, ultimately improving their adaptability and growth in field conditions.