Gardeners love geraniums for their lush leaves and blossoms that come in a wide range of vibrant colors. Instead of buying already started plants from a garden store, save yourself money and grow your own geranium collection from seed. Iowa State University's website says geraniums are very easy to start from seed. Within three months of planting, your seed-started geraniums will produce their iconic flowers and brighten your flower bed, according to North Carolina State University's website.
Fill a quart-sized pot with a commercially prepared seed starter mix. If you don't have such mix on hand, Iowa State University recommends combining equal parts of vermiculite and peat moss.
Sow the geranium seeds at a rate of two per pot. Bury them just 1/8 inch below the soil surface and space them apart by approximately 2 inches.
Water the pot once a day or as required to keep the soil surface moist.
Set the pot in an area that's approximately 75 degrees Fahrenheit. This is the temperature that encourages optimal geranium seed germination, according to Iowa State University. The seeds will typically sprout within a week.
Fertilize the seedlings once a week with any standard fertilized labeled for use on houseplants, applying at 25 percent of the labeled concentration. Using the fertilizer's full application rate may over-fertilize and burn your young geraniums.
Thin the seedlings once they're 3 to 4 inches tall, removing the weaker seedling so that the stronger and taller seedling has the entire pot to itself.
Transplant the geranium outdoors once the last frost date in your area has passed. Dig a hole that's the size of the existing pot. Slide the seedling out of the pot and into the hole, filling in the hole's edges with garden loam.