Deadheading is a big job in this border. Perennials, such as yarrow (Achillea millefolium), coreopsis (Coreopsis verticillata) and garden phlox (Phlox paniculata), are long-blooming, but all good things eventually come to an end. Take the time to get rid of spent flowers and in a couple of weeks many of the plants will provide a second, usually lighter, rebloom.
Be sure to include a few annuals for their long season of bloom and to save some work. The ribbon of wax begonias (Begonia semperflorens) and petunias (Petunia spp. and hybrids) edging the border won’t need deadheading because the faded blooms fall away on their own or are buried beneath new growth.