The purpose of this study was to investigate the impacts of Spirulina platensis algae extract (seaweed) and Saccharomyces cerevisiae yeast extract as bio-stimulants on the growth, flowering, and chemical composition of the Zinnia elegans plants during 2021 and 2022 seasons.When the seedlings reached about 10 cm in length, they were transplanted into individual pots filled with a mixture of clay an...