Geraniums are an adaptable plant in the garden, growing well in both beds and in containers. Use them to liven up window boxes or hanging baskets, or plant them amongst other perennials in the flower bed. Geraniums are perennials, but they do not survive freezing temperatures. In areas with freezing winters, potted geraniums can be brought indoors. Taking care of your geraniums and raising them properly ensures they remain healthy and continue to bloom profusely throughout the summer.
Plant geraniums in full-sun garden beds that drain well and aren't prone to standing water. Plant potted geraniums in 12-inch diameter pots filled with a well-draining potting mix. Set potted geraniums in an area where they receive at least eight hours of sunlight a day.
Plant the geranium transplants to the same depth in the bed or in the permanent pot that they are planted at in their nursery pots. Space bedding geraniums 8 to 12 inches apart. Water thoroughly after planting so any air pockets around the roots collapse.
Fertilize bedded geraniums every four to six weeks throughout spring and summer with a 10-10-10 analysis fertilizer. Apply 2 lbs. of fertilizer per every 100 square feet of garden bed. Fertilize potted geraniums with a liquid houseplant fertilizer with the amount recommended on the fertilizer label.
Lay a 2-inch layer of straw or bark mulch around bedded geraniums. Mulching prevents weeds and helps maintain soil moisture.
Water bedded geraniums once a week, providing about 1 to 2 inches of water at each irrigation. Water potted geraniums when the top 1 inch of soil begins to feel dry, watering until the excess moisture drains from the bottom of the pot.
Inspect plants regularly for signs of disease or insect infestation, such as discolored or damaged leaves. Treat problems with insecticidal soap applications or use the proper pesticide.
Bring in potted geraniums before the first fall frost and place them in a sunny window throughout winter. Water the plant as needed throughout winter. Dig up bedded geraniums after the first frost and cut back the plant to 6 inches tall. Hang them in a cool, dry place over winter, then replant in spring.