When geraniums become stringy and misshapen, they need pruned. The stems will contain leaves that exist on the tips, and the dead shoots and leaves will make the geranium unsightly. Pruning geraniums allows them to grow into healthy flowers; it also encourages new growth after the winter season passes. Geraniums cannot withstand a hard winter, and often require overwintering to protect them from harsh weather conditions. Once you finish pruning the geraniums, remove the cuttings to grow new plants.
Continue to prune leggy stems until 6 to 8 weeks before the first autumn frost date.
Remove cuttings when you prune the geraniums. Cut 2- to 3-inch sections and place them in a mixture of sand and peat moss. Add plenty of water and cover them with a plastic bag. Once they grow roots, ensure that they receive sunlight.
Discard any dead material that you cut, or it will begin to mold next to the geranium, which will ruin the soil.