Some info on control and life cycle here:
https://ag.umass.edu/greenhous...
http://extension.colostate.edu...
If you're overwintering in the pots they are in currently, you may want to change the potting mix in case any are pupating in it. Don't put the old mix back in the garden or compost pile. If they are currently growing in the ground then pot them up for winter in fresh potting mix. Some people winter geraniums bareroot also, or as cuttings.
Having said this, if they are outdoors in the garden currently then the pest may winter over in the garden soil unless it gets cold enough there (check out the links above for details on survival temperature).
