ABSTRACT
Seaweeds have been used since ancient times as soil fertilizer and to turn infertile soil into fertile soil. Seaweeds’ research permitted in the last years to profile various species of seaweeds and their valuable compounds for various fields, such as human food, animal feed, biomedical, and pharmaceutical. In this case, with the pressure to turn agriculture more eco-friendly and lowering the usage of synthetic products, there was a gain in the research for seaweed compounds as plant biostimulants. However, in some countries of the North Atlantic Area, there was a tradition of collecting the seaweeds that came ashore. In Portugal, the most relevant one is named “sargaço.” This chapter explores not only the seaweeds as plant biostimulants but also the data already published about “sargaço” species as plant biostimulants to understand the potential of this tradition.
