The taller coreopsis varieties might need staking as they mature; otherwise, the stems might flop over. Moreover, deadheading your plants (removing the spent blooms) can keep the plant blooming ...

So you may wish to let these plants go their natural course. Reserve your deadheading for daylilies, roses, astilbe, coreopsis, Monarda (bee balm), and others. Consider stopping deadheading in the ...