We investigated the supply of small-flowered, spray-type chrysanthemums to meet the peak demand from July to September (beginning of July, beginning of August, middle of September), using cuttings obtained from the same mother stock, and with night-interruption treatment (NI). Peak demand supply was investigated using 9 varieties that flower from June to July under a natural day length. In ‘Seikomaki’, ‘Subaru’, ‘Haruka’, and ‘Seichigusa’, early budding was completely prevented and flowering was adjusted arbitrarily, using NI. Therefore, we consider that the peak demand can be met using these four varieties. The flowering time under natural day length conditions and the delay of budding induced by NI were investigated in thirty-three June-to-August flowering varieties after planting on 28 April, 2011. Plants flowered between July 4 and July 19 under natural day length conditions and NI delayed budding for more than twenty days in ‘Seiun’, ‘Seikomaki,’, ‘Subaru’, ‘Haruka’, and ‘Seichigusa’, which are suitable to meet the peak demand using NI. This shows that the five varieties had a flowering time and delay of budding induced by NI in common. Therefore, we propose that it is possible to select chrysanthemum varieties suitable to meet the peak demand on the basis of these flowering parameters.