583871 Disclosed is a process for adapting plants to an abiotic stress or to a hydric stress wherein said process comprises at least a step of treatment of the plants by foliar field spraying with a composition comprising at least one xyloglucan polymer or oligomer at a concentration of 0.01 g to 2 g /ha of said xyloglucan polymer or oligomer, said spraying step being realised between 1 and 72 hours before the stress arrives