Gardening: removing the dead or wilted flowers from flowering plants so that the energy and resources of the plant will not go into fruiting but will instead be used to produce more flowers. A good, useful, constructive thing to do in the summer, absentmindedly, as you wander around outside and sing a little tune. A good tune to use is:

Momma had a baby and its head popped off!

Nothing to do with the Grateful Dead at all, so I won't link it.