There are almost 1000 species of Impatiens. When planted outside many species are annuals; in the proper climate, some are perennials. Most species prefer direct sunlight, but can exist in partial shade as well. Impatiens do not grow well under trees. Flowers are plentiful and colorful, appearing from early spring until the first frost.
Nicknamed Touch-me-nots, the seedpods of impatiens explode when touched, scattering seeds. Consistent moisture (but not over-watering) is the trick to growing impatiens. Water less in the shade, more in extreme sun, heat or windy conditions. Do not mulch impatiens, except in full sun exposure. Because they spread and cover the ground, mulch can cause a fungus that will kill plants.
Potted impatiens placed outside can dry out in a day or two. Test soil moisture to determine a watering regimen. The bigger the pot, the better.