Hardy geraniums are perennial flowering plants belonging to the pelargonium genus that are native to South Africa. Depending on the species and cultivar, they can be hardy down to USDA Zone 5 and can be grown in containers and overwintered indoors in colder climates. Hardy geraniums thrive in filtered sunlight and nutrient rich and moist soil. They bloom in the summer and early fall in a wide range of warm and cool hues, from crisp white to deep magenta and bright coral.
Plant your hardy geraniums where they will receive bright direct sunlight in the spring, fall and winter and filtered sunlight or light shade during the heat of summer to prevent wilt and scorching.
Provide a nutrient rich, healthy and easy draining garden soil or fresh sterile potting mix when planting. Choose a container that is roughly an inch or two larger than the plant root ball but no larger in order to keep the plant flowering well. Till up the soil so that it is light and loose upon planting and maintain the same planting level the geranium enjoyed in the nursery pot.
Water your geraniums deeply at planting to settle them in the soil. Thereafter, keep the soil evenly moist but not soaking wet during the late spring and summer with deep watering roughly every 7 to 10 days. Allow the soil to dry out a few inches down in the fall and winter before watering again. Do not water too frequently as wet soil can quickly rot the fleshy stem.
Feed your hardy geraniums with a complete slow release granular fertilizer formula sprinkled around the root area and water in well. Follow the label dosing directions and always err on the side of under-fertilizing to encourage flower production and limit excess foliage growth.