The application of compost mixture in growth media is an integral element for improving growth, flowering and development of bedding plants. To achieve this aim, the present comparative study was conducted on African marigold as a complete block design with 9 treatments (soil amendments: “Agrobiosol”, “Alkan”, “Barvar-2” phosphate biofertilizer, animal and plant vermicompost, animal manure) and 3 replications over 2007 at the Research Field of Landscape Organization Shiraz Municipality, Iran. Chemical properties of soil including EC, pH and organic carbon (OC), N, P, K, Fe, Zn, Cu, and Mn contents were measured prior to and after the experimental period. The seedlings were transplanted in the plots after soil amendments with various substrates. Forty five and 85 days after transplanting (DAT), flower number, length and diameter, florets, flower number per plant, flower durability, shoot, root and flower fresh and dry weight, and visual quality were measured. The results indicated that some traits were affected significantly by soil amendments. The highest flower number, flower fresh weight, shoot fresh and dry weight and visual quality 45 days DAT and also the highest floret number, flower length and shoot fresh and dry weight, 85 DAT were obtained in soil amended with “Alkan”, although the difference was not significant in comparison with some other treatments particularly with plant vermicompost. The highest flower diameter, root fresh and dry weight 45 DAT and the highest flower dry weight and flower number per plant 85 DAT were observed in soil amended withrelated to plant vemicompost., The highest flower length 45 DAT and the highest root fresh and dry weight 85 DAT were obtained soil supplemented with Agrobiosol. No significant differences were observed among the other treatments. According to the finding of this research and regarding economic matters and environmental anxieties, it may be recommended that plant vermicompost be used as a soil amendment in the
