Geraniums can be hung out to dry during the winter so that you can replant the flower in spring. The plants must be removed from the ground or an outdoor container before the first frost or the plant will not be suitable for drying. You can dry the plants through the winter and when all chance of frost has passed, you can replant the geraniums outdoors in the ground or in a container in spring.
Remove the plants from the ground before the first frost by digging around the roots to loosen the ground. Do the same with a container plant. Gently pull the plant out of the ground so that you don't rip the roots.
Shake the plant gently to remove the soil around the roots. Loosely tie a string around the bottom stems of the plant, not the roots. Leave enough string on one end to tie the plant to a hanging rod.
Place a rod somewhere where it will be dry and cool with little to no humidity. The basement is a good place as long as the temperature is between 45 and 50 degrees F. Tie the string to the rod with a bow so that you will be able to remove it easily.
Soak the geranium roots in water for one to two hours once a month. Hang the plants back on the rod when done.
Use a fungicide also known as bulb dust to protect the roots during the winter after watering. You can buy the protective fungicide treatment at a nursery. A light dusting is all the roots need to fight off fungi, but do follow the package directions.
Continue Steps 4 and 5 until spring when all chance of frost has passed before planting outdoors.