Cut the spent stalk back to the point of origin.

You deadhead geraniums by snapping the stem off at the place it is joined to the stem. Thus encourades new growth.

I use a purple handled pet toe-nail trimmer that I ended up buying two of last year at fair time, for trimming rabbit toenals.Well, darn trimmers don't work well on pets nails, but they work grerat on plants. The reason I don't just snap off by hand is my carpal tunnel syndrome leaves me with poor hand control sometimes, and I end up breaking leaf stems too when snapping off spent blooms by hand. Before I had so much nerve damage, I just snapped the blooms off by hand.

Anywhoo, the purple trimmers can handle being run through the dishwasher, so I pop them into the dishwasher after trimming, to reduce chance of spreading things. So, these little trimmers ended up being a good thing. And I learned that rabbit toenails trim just fine with a human toenail trimmers ;-)

Jean