I would deadhead the flower heads - not attractive, and more energy will go into root production if not spent on seed production.

Yup, I cut mine back to the basal foliage every year to tidy them up. I need to go do that soon.

Karen

Sometimes there will be new buds forming further down on the stems. If so, cut back to that spot and you will get further bloom. If not, cut back to crown for new growth.

I planted shasta daisies from seed indoors this past winter, set out the plants in a sunny composted enriched garden this Spring (zone 7). It is now July 29th and I have plenty of foliage but no flower buds. All the zinnias, asters, and sunflowers are doing just fine. Why no bloom? Should I yank these plants at the end of summer or hope for bloom in the second year?

mandorsk - many perennials, including Shasta daisies, won't bloom the first year from seed. I grew them via winter sowing last year and they're blooming this year for the first time. Same with ladybells, lobelia, columbine, blackberry lily, beardtongue, globeflower, carnations and blanket flower. All were grown from seed via winter sowing last year, grew into healthy plants that went dormant in the fall, came up again this year and bloomed.