In this study, the effects of planting density on the growth of chrysanthemum in a greenhouse were evaluated on two popular varieties (i.e., Sinma and Moonlight). Planting density treatments were as follows: 1) 12 cm × 12 cm, 2) 6 cm × 12 cm, 3) 6 cm × 12 cm with one-cell vacant, and 4) 6 cm × 12 cm with two-cell vacant. Size of each treatments indicate one chrysanthemum was planted in that sized cell that was rectangular shaped field and these treatments were located in a line. Moreover, “one and two-cell vacant” means that it makes middle point of the field empty, offers beside chrysanthemum larger spaces to grow. For the Sinma variety, the results of growth and flowering characteristics at the harvesting stage showed that leaf number, leaf length, flower length, and leaf area were highest when the crop was planted at the 12 cm × 12 cm density, and the next preferable density was 6 cm × 12 cm with one-cell vacant. For the Moonlight variety, the results showed that stalk height and diameter, leaf number and length, flower length, leaf area, and flower number were highest at the 12 cm × 12 cm planting density. For Sinma, ratios of marketable production were 87.5% and 83.3% for the 12 cm × 12 cm and 6 cm × 12 cm with two-cell vacant, respectively. For Moonlight, ratios were 88.0% and 84.3% for the 12 cm × 12 cm and 6 cm × 12 cm with two-cell vacant.