Chitosan-based Plant Biostimulant for Natural Growth Promotion. Cationic natural polymers made of glucosamine and N-acetylglucosamine units. This product (CaraGrow) is a balanced mixture of Second Generation “2G” Designer Chitosans, carefully selected and prepared based on more than twenty years of research on molecular structure-function relationships and cellular modes of action of partially acetylated, bioactive chitosans. The 2G chitosans contained in CaraGrow display specific chemical structures customized especially for Plant Growth Promotion and Abiotic Stress Protection in a broad spectrum of crop and horticultural plants. CaraGrow is effective to improve crop performance during periods of unfavorable growing conditions such as drought and salinity in crops like grapevine, fruit trees and vegetables. In contrast to conventional fertilizing agents, CaraGrow is not harmful to the users and it can be applied without waiting time until the harvest of the crop.