Brightly colored geraniums bloom throughout summer in the flower garden or in containers placed around the home. While geraniums are a perennial flower, they are not frost-hardy and do not survive cold winters outside. You could grow them as an annual and replant them each spring, but it is less work and more cost-effective to save your plants from year to year. Bringing the geraniums indoors lets you protect the plants while also allowing you to enjoy the plants inside your home.
Dig up plants in fall before the first frost, if applicable. Dig around the base of each plant to a 8-inch depth, then slide the trowel under the geranium, lifting it from the garden bed.
Fill a 10- to 12-inch-diameter pot with a quality potting mix. Moisten the mix thoroughly, then plant the dug-up geranium in the pot to the same depth it was at in the garden bed.
Bring the potted geraniums indoors. Place them in a sunny, south-facing window where the geraniums receive at least six hours of sunlight a day. Choose a room at 65 to 70 degrees Fahrenheit during the day and 5 to 10 degrees cooler at night.
Water the plants when the top 1 inch of soil begins to feel dry. Provide water to the top of the soil until the excess begins to drain out of the bottom drainage holes in the pot. Empty the drip tray under the pot after each watering.
Fertilize plants once a month when the plant is actively growing. Mix 1 tsp. of water-soluble, 10-10-10 analysis fertilizer with 1 gallon of water and use this solution to water the plants when fertilizing.
Pinch of the top ½ inch of each growing tip to keep the geranium full and to prevent legginess. Trim off any stems that become scraggly or overgrown to keep the plant in shape.
Move the pot outdoors or replant the geranium in the garden after all danger of frost has passed in spring.