Geraniums are either grown from seed or from cuttings. Dynamo, Elite and Orbit are just a few of the common varieties of seed geraniums. Many seed geranium cultivars are early blooming, so are well-suited to indoor-outdoor container culture or in spring flower beds if frost isn't an issue. Geraniums come in nearly any color, including two-color varieties. Caring for these flowers properly ensures they thrive in your garden and bloom all throughout the spring and summer.
Lay a 2-inch layer of compost over a full-sun, well-draining garden bed. Then fertilize with 2 pounds of 5-10-5 analysis fertilizer per 100 square feet prior to planting. For container geraniums, fill an 8-inch diameter flower pot with a moist, quality potting mix and fertilize with 1/2 tsp. of complete fertilizer.
Dig the planting hole in the bed or pot to the same depth as the nursery pot that the seed geranium is in and slightly wider. Set the geranium in the hole so it is at the exact same depth as in its previous pot. Refill the hole and firm the soil around the plant with your hands. Plant one geranium per pot or space the plants 18 inches apart in all directions.
Lay a 2- to 3-inch layer of organic mulch, such as bark, over the the garden bed. Mulch prevents weed growth while preserving moisture in the soil and keepiing the seed geranium's roots cool.
Water bedded geraniums once a week, or often enough to keep the soil moist but not soggy. Water potted geraniums as soon as the soil surface begins to feel dry. Water in the morning so the leaves dry before nightfall, which prevents rot and disease.
Fertilize bedding plants every four to six weeks throughout spring and summer with a 10-10-10 analysis fertilizer applied at the rate of 2 pounds per 100 square feet. Fertilize potted plants once a month with a soluble houseplant fertilizer, following package application instructions.
Bring potted plants indoors before the first fall frost and cut the plants down to a 6-inch height with shears. Place them in a warm, sunny window. Dig up bedded geraniums and either place them in a pot or hang the dug-up plants upside down in a cool, moist place such as a basement or cellar.