Abstract
China aster is a half hardy annual grown for loose as well as cutflowers which are used for flower arrangement, interior decoration, garlanding, worshipping etc. It can be grown in herbaceous borders, flower beds, garden decoration and also as potted plant. Growth regulators play an important role in morphology and physiology of the plants and their effect varies with plant, species, variety, concentration used, method of application, frequency of applications etc. In china aster different growth regulators viz., GA3, NAA, CCC, MH and Paclobutrazol are used either for inducing or retarding growth parameters which ultimately results in better quality and increased flower yield also enhancing the vase life of cut flowers. Spraying of GA3 at 200 ppm enhanced the duration of flowering (90.33), number of flowers per plant (68.54), diameter (4.86 cm), flower weight (3.26 g), flower yield per plant (111.2 g) and vase life (22.88 days). Among growth regulators foliar application of CCC at 1500 ppm recorded the highest flower yield and also flower quality parameters. Soil drench of paclobutrazol at 200 ppm delayed flowering, while early flowering was observed with 25 ppm. Application of MH at 1000 ppm resulted in minimum plant height, inter nodal length, number of leaves per plant and leaf area in china aster.
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