Right now, you'll see many of your flowers looking rather pale. Now is the time to deadhead in order to allow for more blooms a little later on. It also helps tidy up the look of your gardens as well as prevent too much re-seeding.
Echinacea (coneflower) seeds a lot so it's good to leave a few for the birds!
To learn more about Echinacea visit: http://garden.org/learn/articles/view/2047/