Abstract: To improve the production efficiency and the quality of flower, reduce the cost of production and promote the process of popularization and application of Agapanthus praecox, we chose 2-year-old seedlings of Agapanthus praecox from tissue culture as the material and screened the combination of soilless media in preexperiments (corn stalk∶rotted leaf of Agapanthus∶slag=1∶2∶1) as growing media. Based on the modified Hoagland nutrient solution, the test was designed by the orthogonal combination method from the three factors of the concentration, ferric salt and pH at three levels respectively. The effects of different nutrient solution on the morphology and physiological index of Agapanthus praecox were analyzed. The results indicated that Agapanthus praecox poured in the nutrient solution composed of 0.5 times concentration of Hoagland solution added with 1.2 times of ferric salt at pH 6.5 grew robustly, showing rapid accumulation of dry matter and strong resistance to outside stress, which was supposed to be the best formula for soilless cultivation of Agapanthus praecox ssp. Orientalis cv. Big Blue．

Key words: Agapanthus praecox ssp. orientalis cv. Big Blue, soilless culture, agricultural waste, nutrient