AUTHOR=Rouphael Youssef , Colla Giuseppe TITLE=Editorial: Biostimulants in Agriculture JOURNAL=Frontiers in Plant Science VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2020.00040 DOI=10.3389/fpls.2020.00040 ISSN=1664-462X