This study was conducted to investigate the effects of 15 different growing media consisted of coco peat (coir), soil and sand solely or in combination on hyacinth growth and flowering. Twenty two parameters including visual quality, flowering stem number, bulblet number, leaf number, leaf fresh and dry weights, flowering stem height and diameter, floret number, floret length, flowering stem fresh and dry weights, root fresh and dry weights, photosynthesis rate, stomatal conductance, mesophyll efficiency, water use efficiency, transpiration rate, chlorophyll content, quality index and pot weight were measured. Results indicated that growing media affected the measured traits. Parameters such as visual quality, leaf number, leaf fresh and dry weights, flowering stem height, bulblet number and root fresh and dry weights, were higher in the mixture containing equal amount of sand:coco peat compared to other media. The highest photosynthesis rate, mesophyll efficiency, flowering stem fresh weight and floret length were observed in the media containing only coco peat and the highest transpiration rate and stomatal conductance resulted from the medium consisted of only sand. The highest water use efficiency was obtained in soil/coco peat/sand (2:1:1) medium.
