Geraniums are relatively easy to grow from seeds. However, the seedlings are slow growing. They should be sown in early to mid-February to produce flowering plants for spring.
Allow 12 to 16 weeks to get flowering plants. Use containers with good drainage and sterile potting soil or a seed-starting mix. A multi-cell tray that's designed for seed starting is the best way to germinate seeds. Seedlings need lots of light. The ideal growing condition is under lights, but they can also be placed in a south-facing window. Use a water-soluble plant food.