Propagate geraniums can be done by taking cuttings and starting from seeds. Cuttings result in a plant exactly like the parent plant. Seeds taken from hybrids may not have the same properties as the original.
Scarification - Geranium seeds have a hard outer coat that prevents water from penetrating. Before planting the seeds, rub them on sandpaper or nick them with a file to make germination easier. Scarified seeds germinate in seven to 14 days.
Starting Seeds - Start geraniums indoors three months before your last expected frost date. Plant them in individual pots or flats filled with seed starting medium. Cover the seeds with a light layer of soil and keep them slightly moist until they germinate. Once they have true leaves, pot them in 4-inch pots and keep them at temperatures of 22.2 degrees Celsius during the day and 18.3 degrees C at night. Use fluorescent light to provide 14 to 18 hours of light per day. Use a soluble plant food every two weeks.