Yes, Impatiens walleriana can be successfully overwintered indoors. Although it is typically grown as a tender annual in temperate regions due to its frost intolerance, the plant can be brought inside before the first frost to continue blooming through the winter months. To do this, it is recommended to move the plants indoors when temperatures drop below 40°F (4°C) or 60°F (15.5°C) at night. The process involves pruning the stems to half their length before bringing them inside to manage size and reduce stress on the root system. The plants should then be placed in a bright, frost-free location with adequate light, ideally a sunny window, and watered moderately to keep the soil moist but not soggy. Regular fertilization with a half-strength water-soluble fertilizer every two weeks is advised for indoor plants to support continued growth. However, if the plants are infected with downy mildew, they should not be overwintered, as the disease can survive and spread. Alternatively, taking softwood cuttings in the fall is another effective method to propagate new plants for the following year.
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If it keeps going well, I might put the best pot’s contents into a much bigger pot and see just how well the plant can do indoors in my wife’s classroom. Right now, I have a 3’ diameter “bush” of madly flowering (mostly magenta flowers) deep green leafed impatiens plants. It’s gorgeous! For $1 and a little care!! :-)