One way they get the Rose Garden to flower again in September is through plant selection. They choose, wherever possible, re-blooming roses, roses that will bloom again if given the proper maintenance. But THE PROPER MAINTENANCE IS VERY IMPORTANT TO GET THE GARDEN TO RE-FLOWER. As an example they look at a Rosa 'Peggy Rockefeller' the signature rose of this rose garden. About 6 weeks ago they came through and gave these roses a pretty serious pruning. They cut them back significantly to a flowering stem which inspired the growth of 2 new flowering stems so that they actually have significantly more flowers now than if they had just deadheaded the whole time. So, cutting back the rose garden hard about 6 weeks before the party in September is an important technique they use to get the rose garden to flower again.