Gerbera is one of the most important cut flowers in the world that its production is increasing continually. One of the major problems in raising gerbera is a decrease in vase life specially in winter and non-standard greenhouse conditions. In order to decrease this problem, Gerbera flower growers usually use high concentrations of nutrient solutions. With the development of floriculture industry and the need to increase the quantity and quality of flowers, it is required to use useful elements in flower production. Silicon is one of the beneficial minerals. In this study, the effect of adding silicon from potassium silicate and nano silicon, in order to estimate their effect on the flower production, quality and vase life of a gerbera variety called ‘Yanara’ were tested in Isfahan University of Technology. In this experiment, potassium silicate and nano Silicon in various concentrations were applied in seven different treatments including spray of nano Silicon in two concentrations of 12.5 and 25 mg/l(base on SiO 2) , drench of nano Silicon in two concentrations of 12.5 and 25 mg/l (base on SiO 2), drench of potassium silicate in two concentrations of 25 and 50 mg/l (base on SiO 2 ) and control in three replications. Flower characteristics including the numbers, fresh weight and diameter of flowers, diameter and length of the cut flowers cape were recorded during the experiment. conducting post harvest experiment, flowers kept in 450 ml distilled water with 24±2 0 C temperature and 40±4 percent relative humidity and with 13 hours light period. The vase life, water content, dry weight, relative fresh weight and the neck-bending of flowers were measured. Several physiological factors were measured including the relative leaf chlorophyll content, The potential of xylem water in petioles and peduncles, the rate of photosynthesis, trairation, water use efficiency of photosynthesis, stomatal conductance and under stomatal carbon dioxide. Results showed, drench of 25 mg/l nano silicon lead to 42.2 percent increase i number of flowers compared to the control. While the vase life and the diameter of inflorescences were not affected. Using nano Silicon and potassium silicate reduced in water potential of peduncle compared to the control, but it did not influence vase life. Concentration of 25 mg/l nano Silicon compared to the control showed 12.3% reduction in flower fresh weight and led to 21.8% and 23.7% decrease of flower stem’s length than potassium silicate in the forms of drench and spray.Respectively 25 mg/l of potassium silicate concentration to 22.8% increase in flower stem length more than control group and also increased water content of flowers 2.12% more than drench of nano Silicon with 25 mg/l concentration. Also drench application the of 25 mg/l nano Silicon and potassium silicate, respectively reduced 17.3 and 15.6% fresh weight of flower comparation to the control. Concentration of 25 mg/l nano Silicon relative to the control showed 12.3% reduction in the flower fresh weight and decreased 21.8% in the flower stem’s length compared to the potassium silicate with the same concentration. The drench and spray of 12.5 mg/l nano Silicon lead to12.1 and 13.5 percent reduction in flower fresh weight compared to the control. 12.5 mg/l concentration of sprayed nano Silicon increased of 19.9% more relative chlorophyll compared the control, Too 50 mg/l potassium silicate, concentration increased 8.2% neck-bending of gerbera. In general, the different concentrations of nano Silicon and potassium silicate did not have any significant effects on the photosynthetic parameters such as trairation, photosynthesis, water use efficiency and stomatal conductance. The overall impact of nano Silicon on the studied traits was much more evident than the same concentrations of potassium silicate. Cosidering phytotoxicy effects of nano Silicon in high concentrations, It might be of desirable effect if applied in lower concentrations.