A deadheading question

I dead head everything that sets seeds to keep the flowers coming (unless I want the seeds of course  )

Also keeps things looking tidy imho 

I dead head everything as well but geraniums self-deadhead so its mostly picking off the flopping spent head if they're still on. Just had a good clip with the secateurs on all my columbines, irises, lilacs and anemones. Lady's mantle are next, clip-clip.

Some have a set flowering period and deadheading takes off seedheads which most folk don't want as it can either diminish plant vigour or spread seeds everywhere you don't want. Others will rebloom now that they aren't wasting energy on making seeds (like delphs, hollyhocks, roses, etc). And still others like lilacs need to be deadheaded this year so they'll prepare more flowering shoots for next year. This is similar to what we do with strawberries after fruiting - cut off all this year's leaves to make way for stronger growth and fruit next year.

I too deadhead everything - I find it very therapeutic!